SPECTRA PRECISION, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5450429 Efficient linear frequency doubled solid-state laserExpiredJun 02, 94Sep 12, 95[H01S]
5420876 Gadolinium vanadate laserExpiredJun 02, 94May 30, 95[H01S]
5142963 Load referenced pressure reducing valveExpiredOct 25, 91Sep 01, 92[F16K, F15B]
5033847 Angular positioning and calibration of projected reference light planesExpiredJan 09, 90Jul 23, 91[G01B]
5033848 Pendulous compensator for light beam projectorExpiredJul 14, 89Jul 23, 91[G02B, G01C]
4988193 Method and apparatus for measuring incident light angle relative to levelExpiredMar 01, 89Jan 29, 91[G01C, G01D]
4971440 Projection of two orthogonal reference light planesExpiredDec 08, 89Nov 20, 90[G01B]
4852983 Distance simulatorExpiredSep 21, 87Aug 01, 89[G02B]
4758729 Apparatus and method for measuring the included angle of a reflective coneExpiredAug 28, 87Jul 19, 88[G01N]
4654856 Laser beam projection device and arrangement for mounting a laser plasma tube thereinExpiredSep 27, 85Mar 31, 87[H01S]
4629321 Grade setting and calibration arrangement for laser beam projection deviceExpiredSep 27, 85Dec 16, 86[G01C]
4600997 Surveying systemExpiredMay 09, 83Jul 15, 86[G06F, G01C]
4519705 Sighting cap for rotating laser beam transmitterExpiredSep 16, 82May 28, 85[G01B]
4231700 Method and apparatus for laser beam control of backhoe digging depthExpiredApr 09, 79Nov 04, 80[E02F]
4225226 Laser guidance system for crop spraying aircraftExpiredDec 29, 78Sep 30, 80[G01C]
4221483 Laser beam level instrumentExpiredNov 20, 78Sep 09, 80[G01C]

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