US3873226A - Laser beam control system for road paving machines - Google Patents
Laser beam control system for road paving machines Download PDFInfo
- Publication number
- US3873226A US3873226A US378171A US37817173A US3873226A US 3873226 A US3873226 A US 3873226A US 378171 A US378171 A US 378171A US 37817173 A US37817173 A US 37817173A US 3873226 A US3873226 A US 3873226A
- Authority
- US
- United States
- Prior art keywords
- tape
- machine
- indicia
- working
- earth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/004—Devices for guiding or controlling the machines along a predetermined path
- E01C19/006—Devices for guiding or controlling the machines along a predetermined path by laser or ultrasound
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/004—Devices for guiding or controlling the machines along a predetermined path
- E01C19/008—Devices for guiding or controlling the machines along a predetermined path by reference lines placed along the road, e.g. wires co-operating with feeler elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4866—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing
- E01C19/4873—Apparatus designed for railless operation
Definitions
- ABSTRACT Apparatus for controlling the elevation of the pavement distributor head of a mobile road paving machine in predetermined relationship to a fixed horizontal plane, as set by a laser beam which is periodically swept across such plane, such apparatus comprising a tape dispensing device carried by the machine to dispense a tape of indefinite length therefrom at zero velocity relative to the surface being paved, and a tape reader for detecting indicia on the tape at predetermined intervals to increase or decrease the predetermined relationship between the pavement dispensing head and the fixed plane, to thereby increase or decrease the elevation of the paved surface at predetermined intervals.
- such apparatus comprises a laser beam generating device remote from the machine to periodically project a laser beam along a multitude of paths lying in a horizontal plane, and a servo system, including a laser beam receiver carried by the machine, for sensing the height of the laser beam plane and for raising or lowering the elevation of the earth engaging tool to maintain a predetermined difference between the tool and the laser beam.
- any earth working machine particularly a road paving machine, may be provided with a coil or reel of tape which is unwound onto the earth surface being worked as the machine moves along its intended path of travel.
- This tape is provided with periodically spaced indicia which indicates the distance travelled by the machine.
- the machine is provided with a servo system that includes a tape reader for reading the indicia on the tape and for changing the predetermined distance between the laser plane and the elevation of the earth working tool, such as the pavement distributor ofa paving machine, which is then being established by the laser beam control system.
- an object of the present invention to provide an improved elevation control system for an earth working machine. More particularly, it is an object of the present invention to provide an improved laser beam actuated control system for accurately controlling the elevation of the earth working tool of an earth working machine as a variable function of the distance traversed by the machine from a known location as it moves along its intended path of travel, and it is an even more particular object of the present invention to provide a road paving machine with such an improved laser beam actuated control system for controlling the elevation of the vertically adjustable pavement distributor thereof.
- FIG. 1 is a perspective view of a self-propelledtype of bituminous paving machine incorporating a control system in accordance with the present invention
- FIG. 2 is a fragmentary plan view of a typical portion of the tape being dispensed by the paving machine of FIG. 1;
- FIG. 3 is a schematic view of the control system of the paving machine.
- FIG. 4 is a schematic view of a control which is an alternate to that shown in FIG. 3.
- the control system of the present invention may be applied to a bituminous paving machine, shown generally at 11.
- paving machine 11 may be considered to be of the self-powered type manufactured by the Construction Equipment Division of Blaw-Knox Company under the designation PF220, except as is otherwise hereinafter specifically described.
- Paving machine 11 is shown as receiving a fresh load of bituminous paving material in a hopper portion at its front end from a conventional dump truck 12, shown fragmentarily.
- a thin laterally extending layer of bituminous paving material 13 is applied to the road bed by one or more generally laterally extending pavement distributors, shown as two distributors 14 each of which may be considered toextend at a slight angle as it extends from the center of the road toward the edge, in order to properly crown the road for the drainage of water therefrom.
- a laser beam receiving device of such a type is capable of adjustment in elevation, relative to the elevation of one or both of the pavement distributors, in increments of 0.01 feet over a total range of adjustment of 5 feet, there thereby being 500 different predetermined relationships between the elevations of the laser beam receiver and the controlled pavement distributor which can be selected by the operator.
- This fact can be used to advantage to accurately and automatically control the grade of the paved surface at a non-horizontal angle or at a variable angle, that is at an angle which is not parallel to the plane along which the laser beam is projected or which periodically changes from the angle of such plane, by providing means to automatically select a different one of the 500 of such predetermined relationships as the machine travels to each of a plurality of different locations along its longitudinal path of travel from a known starting location.
- Tape 19 is preferably of a weather-resistant, relatively non-stretchable material such as Mylar, and it is fed at zero velocity rel- 'ative to the paved surface over distributor 14, to be applied to the paved surface 13 by a floating press down wheel 2] which is attached to paving machine 11.
- the longitudinal location on the tape at which it is desired to select one of the 500 predetermined relationships to be controlled by the laser beam actuated control system can be indicated by the binary coded placement of punched holes 22, it being necessary to have ninepositions at each longitudinal position along the tape, extending in lateral rows thereacross, where such holes can be placed or omitted to select from 500 possible predetermined locations.
- the tape may also be advantageously provided with visually detectable station and elevation identification data, 23 and 24 respectively, to permit inspectors to verify the elevation or grade of the road after the paving machine has passed thereover. I
- paving machine 11 To determine the distance that paving machine 11 has travelled from a known starting point by the binary coded placement of punched holes 22 thereon, paving machine 11 is provided with a tape reader 25 of conventional character. At the start of the paving operation, the tape 19 is pulled through reader 25 and is positioned properly on the ground at the start point. The tape reader will then sense the first location which is indicated on the tape 19 and will deliver this information, in binary code, to a memory circuit 26. The memory circuit 26, in turn, activates a driver 27 which is operatively connected to an electronic display panel 28. In the meanwhile the position of the vertically adjustable laser beam receiver 17 is mechanically sensed and is indicated on a mechanical counter 29, preferably mounted closely adjacent electronic display 28 at the operators station so that equivalent readings on the two devices can be quickly verified.
- some simplification in the control circuitry may be achieved with the use of a tape 119 having eleven positions for the location of punched holes, rather than the nine positions on tape 19.
- the first nine of such positions provide the display through the memory and driver circuits 26 and 27, as heretofore described.
- the next two positions provide the elevation change information to an up-down decoder circuit 36 which determines any required change and appropriately instructs the up circuit 32 or down circuit 33.
- Up circuit 32 or down circuit 33 as the case may be, in turn will to cause strobe 35 to strobe memory circuit 26 cause it to remember the new elevation rather than the previous elevation.
- Apparatus for controlling the vertical height of a vertically adjustable working tool of a mobile earthworking machine comprising, in combination:
- control means responsive to said laser beam for maintaining a pre-determined vertical relationship between said plane and the vertical height of said tool
- adjustment means for changing said pre-determined relationship at predetermined locations along the intended path of travel of the said machine, said adjustment means comprising:
- reader means responsive to said indicia and operatively associated with said control means for changing said predetermined relationship as a function of the distance traveled by said machine.
- Apparatus according to claim 1 wherein said indicia on said tape comprises binary coded punched holes and wherein said reader means comprises a reader for reading binary coded information.
- Apparatus for controlling the working height of an earth-working tool carried by a mobile vehicle and vertically adjustable relative thereto by power means comprising: l
- a dispenser for said tape mounted on said vehicle and constructed and arranged to dispense tape as said vehicle moves from said reference point atzero velocity relative to the ground traversed;
Abstract
Description
Claims (18)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US378171A US3873226A (en) | 1973-07-11 | 1973-07-11 | Laser beam control system for road paving machines |
US05/557,572 US3953145A (en) | 1973-07-11 | 1975-03-12 | Laser beam control system for earthworking or similar machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US378171A US3873226A (en) | 1973-07-11 | 1973-07-11 | Laser beam control system for road paving machines |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/557,572 Continuation-In-Part US3953145A (en) | 1973-07-11 | 1975-03-12 | Laser beam control system for earthworking or similar machines |
Publications (1)
Publication Number | Publication Date |
---|---|
US3873226A true US3873226A (en) | 1975-03-25 |
Family
ID=23492042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US378171A Expired - Lifetime US3873226A (en) | 1973-07-11 | 1973-07-11 | Laser beam control system for road paving machines |
Country Status (1)
Country | Link |
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US (1) | US3873226A (en) |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4103973A (en) * | 1977-04-06 | 1978-08-01 | Cutler Repaving, Inc. | Depth control for asphalt pavement milling machine |
US4655633A (en) * | 1985-09-23 | 1987-04-07 | David W. Somero | Screeding apparatus and method |
US4830489A (en) * | 1986-08-20 | 1989-05-16 | Spectra-Physics, Inc. | Three dimensional laser beam survey system |
US4852278A (en) * | 1986-06-27 | 1989-08-01 | Kajima Corporation | Method and apparatus for grading and measuring a surface having a curved profile |
US4861189A (en) * | 1987-02-26 | 1989-08-29 | Kajima Corporation | System for paving inclined and/or curved surfaces |
US4895440A (en) * | 1988-08-22 | 1990-01-23 | Spectra-Physics, Inc. | Laser-based measurement system |
US4930935A (en) * | 1988-12-29 | 1990-06-05 | David W. Somero | Screeding apparatus and method |
US4978246A (en) * | 1989-07-18 | 1990-12-18 | Quenzi Philip J | Apparatus and method for controlling laser guided machines |
US5000564A (en) * | 1990-03-09 | 1991-03-19 | Spectra-Physics, Inc. | Laser beam measurement system |
US5039249A (en) * | 1989-08-18 | 1991-08-13 | Hansen Joel D | Apparatus for screening and trowelling concrete |
US5076690A (en) * | 1990-05-14 | 1991-12-31 | Spectra-Physics Laserplane, Inc. | Computer aided positioning system and method |
US5137354A (en) * | 1990-07-18 | 1992-08-11 | Spectra-Physics, Inc. | Computer aided three dimensional positioning sensing system and method |
US5201603A (en) * | 1991-05-17 | 1993-04-13 | Caterpillar Paving Products Inc. | Tow point for an asphalt paver |
US5375663A (en) * | 1993-04-01 | 1994-12-27 | Spectra-Physics Laserplane, Inc. | Earthmoving apparatus and method for grading land providing continuous resurveying |
US5517419A (en) * | 1993-07-22 | 1996-05-14 | Synectics Corporation | Advanced terrain mapping system |
US6203244B1 (en) | 1998-01-15 | 2001-03-20 | Van-Boh Systems, Inc. | Screeding apparatus |
US20030161684A1 (en) * | 2002-02-27 | 2003-08-28 | Quenzi Philip J. | Apparatus and method for subgrade preparation |
US20060008323A1 (en) * | 2004-07-06 | 2006-01-12 | Torvinen Jeffrey W | Apparatus and method for subgrade preparation |
AU2005232270B1 (en) * | 2005-11-10 | 2006-07-20 | Kevin James Moller | A Laser Leveling System |
US20080249738A1 (en) * | 2003-06-17 | 2008-10-09 | Robert Ernest Troxler | Method of determining a dimension of a sample of a construction material and associated apparatus |
US20100296867A1 (en) * | 2009-05-20 | 2010-11-25 | Joseph Voegele Ag | Road finisher |
CN104328728A (en) * | 2014-10-29 | 2015-02-04 | 湖南三一路面机械有限公司 | Paver and contrition method thereof |
US20150330054A1 (en) * | 2014-05-16 | 2015-11-19 | Topcon Positioning Systems, Inc. | Optical Sensing a Distance from a Range Sensing Apparatus and Method |
US9273951B2 (en) | 2011-06-06 | 2016-03-01 | Troxler Electronic Laboratories, Inc. | Optical method and apparatus for determining a characteristic such as volume and density of an excavated void in a construction material |
US9290891B1 (en) | 2013-11-20 | 2016-03-22 | Buck Wayne Caswell | Laser guide apparatus, system and method for asphalt paving equipment |
US9587938B2 (en) | 2003-06-17 | 2017-03-07 | Troxler Electronic Laboratories, Inc. | Method and apparatus for determining a characteristic of a construction material |
US11686051B2 (en) | 2021-11-09 | 2023-06-27 | Pim Cs Llc | Ponding alleviation process |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2796685A (en) * | 1951-12-15 | 1957-06-25 | Bensinger Isabell Mck | Method and apparatus for earth grading and allied arts |
US2916836A (en) * | 1955-06-24 | 1959-12-15 | Karl J Stewart | Photoelectric automatic blade level control |
US3071049A (en) * | 1959-12-21 | 1963-01-01 | Impresa Pizzarotti & C S R L | Method and apparatus for laying a bituminous road mat |
US3540360A (en) * | 1968-08-02 | 1970-11-17 | Cmi Corp | Control systems for road construction machinery |
US3554291A (en) * | 1967-11-08 | 1971-01-12 | Baldwin Lima Hamilton Corp | Level and slope control for surfacing machines |
US3604512A (en) * | 1969-09-16 | 1971-09-14 | Caterpillar Tractor Co | Electrooptical control system for vehicles |
US3674094A (en) * | 1970-08-31 | 1972-07-04 | Honeywell Inc | Automatic slope controller |
US3691916A (en) * | 1970-12-30 | 1972-09-19 | Barber Greene Co | Proportional screed control for a finisher |
US3709116A (en) * | 1970-03-02 | 1973-01-09 | British Railways Board | Slip-form paving machines |
-
1973
- 1973-07-11 US US378171A patent/US3873226A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2796685A (en) * | 1951-12-15 | 1957-06-25 | Bensinger Isabell Mck | Method and apparatus for earth grading and allied arts |
US2916836A (en) * | 1955-06-24 | 1959-12-15 | Karl J Stewart | Photoelectric automatic blade level control |
US3071049A (en) * | 1959-12-21 | 1963-01-01 | Impresa Pizzarotti & C S R L | Method and apparatus for laying a bituminous road mat |
US3554291A (en) * | 1967-11-08 | 1971-01-12 | Baldwin Lima Hamilton Corp | Level and slope control for surfacing machines |
US3540360A (en) * | 1968-08-02 | 1970-11-17 | Cmi Corp | Control systems for road construction machinery |
US3604512A (en) * | 1969-09-16 | 1971-09-14 | Caterpillar Tractor Co | Electrooptical control system for vehicles |
US3709116A (en) * | 1970-03-02 | 1973-01-09 | British Railways Board | Slip-form paving machines |
US3674094A (en) * | 1970-08-31 | 1972-07-04 | Honeywell Inc | Automatic slope controller |
US3691916A (en) * | 1970-12-30 | 1972-09-19 | Barber Greene Co | Proportional screed control for a finisher |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4103973A (en) * | 1977-04-06 | 1978-08-01 | Cutler Repaving, Inc. | Depth control for asphalt pavement milling machine |
US4655633A (en) * | 1985-09-23 | 1987-04-07 | David W. Somero | Screeding apparatus and method |
US4852278A (en) * | 1986-06-27 | 1989-08-01 | Kajima Corporation | Method and apparatus for grading and measuring a surface having a curved profile |
US4830489A (en) * | 1986-08-20 | 1989-05-16 | Spectra-Physics, Inc. | Three dimensional laser beam survey system |
US4861189A (en) * | 1987-02-26 | 1989-08-29 | Kajima Corporation | System for paving inclined and/or curved surfaces |
US4895440A (en) * | 1988-08-22 | 1990-01-23 | Spectra-Physics, Inc. | Laser-based measurement system |
US4930935A (en) * | 1988-12-29 | 1990-06-05 | David W. Somero | Screeding apparatus and method |
US4978246A (en) * | 1989-07-18 | 1990-12-18 | Quenzi Philip J | Apparatus and method for controlling laser guided machines |
US5039249A (en) * | 1989-08-18 | 1991-08-13 | Hansen Joel D | Apparatus for screening and trowelling concrete |
US5000564A (en) * | 1990-03-09 | 1991-03-19 | Spectra-Physics, Inc. | Laser beam measurement system |
US5076690A (en) * | 1990-05-14 | 1991-12-31 | Spectra-Physics Laserplane, Inc. | Computer aided positioning system and method |
US5137354A (en) * | 1990-07-18 | 1992-08-11 | Spectra-Physics, Inc. | Computer aided three dimensional positioning sensing system and method |
US5201603A (en) * | 1991-05-17 | 1993-04-13 | Caterpillar Paving Products Inc. | Tow point for an asphalt paver |
US5375663A (en) * | 1993-04-01 | 1994-12-27 | Spectra-Physics Laserplane, Inc. | Earthmoving apparatus and method for grading land providing continuous resurveying |
US5517419A (en) * | 1993-07-22 | 1996-05-14 | Synectics Corporation | Advanced terrain mapping system |
US6203244B1 (en) | 1998-01-15 | 2001-03-20 | Van-Boh Systems, Inc. | Screeding apparatus |
US20030161684A1 (en) * | 2002-02-27 | 2003-08-28 | Quenzi Philip J. | Apparatus and method for subgrade preparation |
US20080249738A1 (en) * | 2003-06-17 | 2008-10-09 | Robert Ernest Troxler | Method of determining a dimension of a sample of a construction material and associated apparatus |
US9587938B2 (en) | 2003-06-17 | 2017-03-07 | Troxler Electronic Laboratories, Inc. | Method and apparatus for determining a characteristic of a construction material |
US8185344B2 (en) | 2003-06-17 | 2012-05-22 | Troxler Electronic Laboratories, Inc. | Method of determining a dimension of a sample of a construction material and associated apparatus |
US20060008323A1 (en) * | 2004-07-06 | 2006-01-12 | Torvinen Jeffrey W | Apparatus and method for subgrade preparation |
US7311466B2 (en) | 2004-07-06 | 2007-12-25 | Somero Enterprises, Inc. | Apparatus and method for subgrade preparation |
AU2005232270B1 (en) * | 2005-11-10 | 2006-07-20 | Kevin James Moller | A Laser Leveling System |
US8337118B2 (en) * | 2009-05-20 | 2012-12-25 | Joseph Vögele AG | Road finisher |
US20100296867A1 (en) * | 2009-05-20 | 2010-11-25 | Joseph Voegele Ag | Road finisher |
US9273951B2 (en) | 2011-06-06 | 2016-03-01 | Troxler Electronic Laboratories, Inc. | Optical method and apparatus for determining a characteristic such as volume and density of an excavated void in a construction material |
US9290891B1 (en) | 2013-11-20 | 2016-03-22 | Buck Wayne Caswell | Laser guide apparatus, system and method for asphalt paving equipment |
US9447551B1 (en) | 2013-11-20 | 2016-09-20 | Buck Wayne Caswell | Laser guide apparatus, system and method for asphalt paving equipment |
US20150330054A1 (en) * | 2014-05-16 | 2015-11-19 | Topcon Positioning Systems, Inc. | Optical Sensing a Distance from a Range Sensing Apparatus and Method |
CN104328728A (en) * | 2014-10-29 | 2015-02-04 | 湖南三一路面机械有限公司 | Paver and contrition method thereof |
US11686051B2 (en) | 2021-11-09 | 2023-06-27 | Pim Cs Llc | Ponding alleviation process |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SPECTRA-PHYSICS, INC., A CA CORP. Free format text: MERGER;ASSIGNORS:LASERPLANE CORPORATION, AN OH CORP. MERGED INTO;SPO, INC., AN OH CORP. MERGED INTO;REEL/FRAME:004289/0229 Effective date: 19820927 Owner name: SPECTRA-PHYSICS, INC. Free format text: MERGER;ASSIGNORS:LASERPLANE CORPORATION, AN OH CORP. MERGED INTO;SPO, INC., AN OH CORP. MERGED INTO;REEL/FRAME:004289/0229 Effective date: 19820927 |
|
AS | Assignment |
Owner name: SPECTRA-PHYSICS, INC., Free format text: MERGER;ASSIGNOR:SPECTRA-PHYSICS, INC., (A DE. CORP.) MERGED INTO) SUNSHINE ACQUISITION CORP. (DELAWARE) (A DE. CORP.) (CHANGED TO);REEL/FRAME:004854/0651 Effective date: 19870805 Owner name: SPECTRA-PHYSICS, INC., (A CORP. OF DE) Free format text: CHANGE OF NAME;ASSIGNOR:SPECTRA-PHYSICS (DELAWARE), INC., A CORP. OF DE (CHANGED TO);REEL/FRAME:004854/0646 Effective date: 19870213 Owner name: SPECTRA-PHYSICS (DELAWARE) INC. A CORP. OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SPECTRA-PHYSICS, INC., (A CA CORP.) (MERGED INTO);REEL/FRAME:004854/0640 Effective date: 19870128 |
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AS | Assignment |
Owner name: SPECTRA-PHYSICS LASERPLANE, INC., 5475 KELLENBURGE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SPECTRA-PHYSICS, INC., A CORP. OF DE;REEL/FRAME:005668/0660 Effective date: 19910409 |