Angle measuring or angular axial alignment > Apex of angle at observing or detecting station > Scale and remote point simultaneously observable > Artificial reference > Patents

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Browse by Category: Main > Optical & Optics

Class Information
Number: 356/143
Name: Optics: measuring and testing > Angle measuring or angular axial alignment > Apex of angle at observing or detecting station > Scale and remote point simultaneously observable > Artificial reference
Description: Subject matter including, for the purpose of establishing a reference line or plane from which the angle can be measured, means which tends to maintain its orientation in space irrespective of changes in the orientation of the supporting structure for this means.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6104479	Laser system	Aug. 15, 2000
5999252	Method for marking workpieces	Dec. 7, 1999
5898484	Hand-held distance-measurement device with an enhanced viewfinder	Apr. 27, 1999
5847820	Laser apparatus for sensing rotational orientation and levelness	Dec. 8, 1998
5784182	Directional sight for instruments	Jul. 21, 1998
5274432	Tow vehicle alignment method and apparatus	Dec. 28, 1993
4811062	Method for aligning first and second objects relative to each other and apparatus for practicing this method	Mar. 7, 1989
4681438	Automatic compensator for compensating collimation error due to two-directional inclination in surveying instruments	Jul. 21, 1987
4398821	Instrument for measuring angles	Aug. 16, 1983