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Browse by Category: Main > Optical & Optics
Class Information
Number: 356/249
Name: Optics: measuring and testing > Fiducial instruments > Artificial reference > Liquid surface (e.g., bubble level)
Description: Subject matter where the artificial reference is determined by the surface of a fluid.










Patents under this class:

Patent Number Title Of Patent Date Issued
8695266 Reference beam generating apparatus Apr. 15, 2014
8060344 Method and system for automatically performing a study of a multidimensional space Nov. 15, 2011
7409312 Handheld laser light detector with height correction, using a GPS receiver to provide two-dimensional position data Aug. 5, 2008
7299557 Tilt sensor Nov. 27, 2007
6675489 Laser sighting device Jan. 13, 2004
6649927 Tilt detecting device Nov. 18, 2003
6625895 Servo-controlled automatic level and plumb tool Sep. 30, 2003
6410932 Radiation-sensitive-device based level Jun. 25, 2002
6384913 Active compensator damping in laser transmitters May. 7, 2002
6324455 Laser level selection Nov. 27, 2001
6248989 Tilt detecting device Jun. 19, 2001
6204498 Inclination sensor and surveying instrument using the same Mar. 20, 2001
6137568 Optical axis compensator Oct. 24, 2000
6128076 Apparatus for measuring truck tilt and preventing roll-over Oct. 3, 2000
5959729 Automatic tilt angle compensator Sep. 28, 1999
5953116 Tilt detecting device Sep. 14, 1999
5946087 Laser survey instrument Aug. 31, 1999
5893215 Inclination sensor and surveying instrument using the same Apr. 13, 1999
5847824 Automatic angle compensator Dec. 8, 1998
5844679 System for adjusting the orientation of a plane of laser light Dec. 1, 1998
5684579 Automatic tilt angle compensator Nov. 4, 1997
5682233 Interstitial fluid sampler Oct. 28, 1997
5636018 Laser beam survey instrument having a tiltable laser beam axis and tilt detectors Jun. 3, 1997
5513001 Tilt angle automatic compensator in all directions Apr. 30, 1996
5485266 Laser beam survey instrument having a tiltable laser beam axis and tilt detectors Jan. 16, 1996
5392112 Inclination angle metering apparatus Feb. 21, 1995
5371951 Two-axis inclinometer Dec. 13, 1994
4993162 Apparatus for measuring inclinations of a component Feb. 19, 1991
4988193 Method and apparatus for measuring incident light angle relative to level Jan. 29, 1991
4970629 Headlamp assembly Nov. 13, 1990
4902129 Orientation indicator for a flexible fiberscope or endoscope including method of manufacture Feb. 20, 1990
4869590 Geodetic instrument Sep. 26, 1989
4802067 Headlight aiming and leveling device Jan. 31, 1989
4794495 Headlamp assembly Dec. 27, 1988
4666299 Inclination measuring apparatus having a prism with associated liquid container May. 19, 1987
4441818 Deflection unit Apr. 10, 1984
4291982 Multi-purpose surveying instrument Sep. 29, 1981
4269508 Device for adjusting the azimuthal and inclination directions of a wave reflector May. 26, 1981
4154532 High precision optical alignment system May. 15, 1979
4149321 Mercury leveling instruments Apr. 17, 1979
4135823 Optical assembly for generating light beams accurately at right-angles to each other Jan. 23, 1979
4119382 Self-leveling construction alignment laser Oct. 10, 1978
4097879 Device in a camera for imparting pictures on a photographic film with a top-and-bottom indication Jun. 27, 1978
4082466 Optical sighting instrument Apr. 4, 1978
4053238 Self-leveling construction alignment laser Oct. 11, 1977
4043679 Self-leveling construction alignment laser Aug. 23, 1977
4040752 Laser unit with a laser beam automatically aligned to the vertical direction Aug. 9, 1977











 
 
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