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Class Information
Number: 33/391
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Level or plumb, terrestrial gravitation responsive > Pendulum
Description: Device wherein the responsive portion is a body, so supported as to be free to swing to a position wherein (1) its center of gravity, or (2) its center of buoyancy, is utilized to determine the vertical.










Sub-classes under this class:

Class Number Class Name Patents
33/397 Gimbal mounted 20
33/399 Indicium adjustably fixed to reference-surface section or to weight 12
33/396 Liquid buoyed 31
33/402 Means limiting swing 21
33/401 Motion transmitting mechanism drives indicator (e.g., gearing, magnetic coupling) 14
33/392 Plumb line (i.e., flexible, line suspended plumb bob) 78
33/395 Plural, coacting in intersecting planes 19
33/398 Weight, variable quantity or center of gravity 14


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8671582 Tilt indicator Mar. 18, 2014
8336218 Inclination sensor Dec. 25, 2012
8074366 Sensor and method for motion measurement of co-existing tilt and horizontal acceleration Dec. 13, 2011
8074367 Motion sensor for measurement in a dynamic environment of co-existing tilt and horizontal acceleration Dec. 13, 2011
7913404 Alignment tool and method of checking wheel alignment Mar. 29, 2011
7913407 Inclinometer Mar. 29, 2011
7845087 Apparatus and method for measuring and controlling pendulum motion Dec. 7, 2010
7685722 Compact celestial navigation device Mar. 30, 2010
7594286 Angle indicator Sep. 29, 2009
7543391 Leveling, plumbing, and angular calibration instrument with a swinging suspended vertical body Jun. 9, 2009
7484305 Gauge for use in a surgical procedure Feb. 3, 2009
7430809 Inclination sensor Oct. 7, 2008
7395605 Apparatus and method for measuring and controlling pendulum motion Jul. 8, 2008
7392593 Angle meter and spirit level Jul. 1, 2008
7383637 Inclination sensor and method of attaching the same Jun. 10, 2008
7353615 Anti-vibration tilt detector Apr. 8, 2008
7325322 Electric park brake inclinometer Feb. 5, 2008
7318283 Inclination sensor Jan. 15, 2008
7305771 Rotation sensor Dec. 11, 2007
7178377 Inclination sensor Feb. 20, 2007
7137209 Level and protractor Nov. 21, 2006
7121012 Apparatus and method for measuring and controlling pendulum motion Oct. 17, 2006
7073269 Self-leveling laser alignment tool and method thereof Jul. 11, 2006
6966154 Earthquake protection consisting of vibration-isolated mounting of buildings and objects using virtual pendulums with long cycles Nov. 22, 2005
6941666 Forklift mast position indicator Sep. 13, 2005
6935035 Slopemaster Aug. 30, 2005
6877240 Apparatus for indicating correct or faulty back posture Apr. 12, 2005
6874240 Angle measuring and level combination device Apr. 5, 2005
6848188 Laser alignment device providing multiple references Feb. 1, 2005
6826844 Downsized sensor unit with increased accuracy Dec. 7, 2004
6779276 Level system Aug. 24, 2004
6763599 Plumb bob apparatus Jul. 20, 2004
6722049 Inclination measurement apparatus Apr. 20, 2004
6694631 Alignment device utilizing components responsive to gravity Feb. 24, 2004
6664534 Tilt sensing device and method for its operation Dec. 16, 2003
6651355 Range finder for bow hunter Nov. 25, 2003
6625895 Servo-controlled automatic level and plumb tool Sep. 30, 2003
6594912 Electronic plumb indicator for monopoles, survey poles, global positioning antennas and the like Jul. 22, 2003
6546639 Inclination measurement apparatus Apr. 15, 2003
6543147 Tilt detector Apr. 8, 2003
6499220 Inclination sensor Dec. 31, 2002
6470580 Tilt sensor Oct. 29, 2002
6453574 Method for aligning a cassette pod to an overhead hoist transport system Sep. 24, 2002
6439543 Leveling device Aug. 27, 2002
6351890 Laser light referencing tool Mar. 5, 2002
6279243 Apparatus for indicating correct or faulty back posture Aug. 28, 2001
6219926 Ruler for measuring and marking lengths and angles relative to a horizontal plane utilizing gravity Apr. 24, 2001
6073356 Inclinometer Jun. 13, 2000
6032376 Pendulum line level Mar. 7, 2000
5992029 Automatic laser plumb line Nov. 30, 1999

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