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Class Information
Number: 33/364
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Magnetic field responsive > Liquid buoyed magnetic needle
Description: Device wherein the means influenced by the external magnetic field is a magnetic element (i.e., compass needle) partially or wholly supported by a liquid.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7331114 |
Magnetic compass structure |
Feb. 19, 2008 |
| 7194814 |
Self-balancing, no-spin magnet compass |
Mar. 27, 2007 |
| 6708415 |
Magnetic compass structure |
Mar. 23, 2004 |
| 6665944 |
Magnetic marine compass |
Dec. 23, 2003 |
| 6493953 |
Marine compass and package |
Dec. 17, 2002 |
| 6357128 |
Low profile compass with removable protective cover and magnetic bull's eye alignment system |
Mar. 19, 2002 |
| 6094830 |
Inclination-compensating display device for a compass |
Aug. 1, 2000 |
| 5752322 |
Gimballed ouroboros compass device with digital logic |
May. 19, 1998 |
| 5669148 |
Altered light navigation device |
Sep. 23, 1997 |
| 5528837 |
Adjustable magnetic compass |
Jun. 25, 1996 |
| 5517430 |
Real-time digital orientation device |
May. 14, 1996 |
| 5477470 |
Real-time digital orientation device |
Dec. 19, 1995 |
| 5469630 |
Gimballed compass device |
Nov. 28, 1995 |
| 5469631 |
Air bubble free compass and method of manufacturing same |
Nov. 28, 1995 |
| 5448835 |
Compass device |
Sep. 12, 1995 |
| 5151753 |
Non-parallax optical sighting instrument |
Sep. 29, 1992 |
| 5146687 |
Compass |
Sep. 15, 1992 |
| 5107597 |
Magnetic compass |
Apr. 28, 1992 |
| 5079845 |
Dual readout analog/digital magnetic compass |
Jan. 14, 1992 |
| 5079846 |
Floating disk compass |
Jan. 14, 1992 |
| 4953304 |
Mask compass |
Sep. 4, 1990 |
| 4930224 |
Magnetic compass |
Jun. 5, 1990 |
| 4920656 |
Compass assembly with dial biasing disk |
May. 1, 1990 |
| 4910459 |
Magnetic tile sensor with a non-magnetic case having a flange and a cover cold welded thereon |
Mar. 20, 1990 |
| 4905377 |
Traveler's direction finder |
Mar. 6, 1990 |
| 4885535 |
Magnetic tilt sensor with permanent magnet surrounding magnetic sensing element |
Dec. 5, 1989 |
| 4866379 |
Tilt sensor having central first bottom surface and second contiguous bottom surface at an angle thereto |
Sep. 12, 1989 |
| 4848002 |
Self-centering needle-less magnetic compass |
Jul. 18, 1989 |
| 4803426 |
Magnetic tilt sensor |
Feb. 7, 1989 |
| 4763419 |
Optical viewing system |
Aug. 16, 1988 |
| 4667414 |
Direction-finding devices |
May. 26, 1987 |
| 4601106 |
Vibration attenuator |
Jul. 22, 1986 |
| 4577414 |
Remotely readable fiber optic compass |
Mar. 25, 1986 |
| 4488431 |
Wind speed and direction indicator and electric current generating means |
Dec. 18, 1984 |
| 4481810 |
Adjustable wind direction devices |
Nov. 13, 1984 |
| 4471534 |
Remote reading compass with 360 degree roll capability |
Sep. 18, 1984 |
| 4453317 |
Magnetic compass |
Jun. 12, 1984 |
| 4438568 |
Recreational compass |
Mar. 27, 1984 |
| 4402140 |
Telescope with compass |
Sep. 6, 1983 |
| 4359823 |
Gravity adjusted compass |
Nov. 23, 1982 |
| 4303172 |
Compass hood |
Dec. 1, 1981 |
| 4250627 |
Compass apparatus |
Feb. 17, 1981 |
| 4236316 |
Vessel adaptable to the expansion and/or contraction of fluid therein |
Dec. 2, 1980 |
| 4227313 |
Compasses |
Oct. 14, 1980 |
| 4156178 |
Terrestrial magnetism responsive device including a pair of balanced north seeking magnets rotatable on a magnetic axis |
May. 22, 1979 |
| 4150491 |
Indicator of true wind direction for sail boats |
Apr. 24, 1979 |
| 4110914 |
Hand compasses |
Sep. 5, 1978 |
| 4027398 |
Single pivot remote reading compass |
Jun. 7, 1977 |
| 4004348 |
High pressure compass housing |
Jan. 25, 1977 |
| 3956831 |
Attitude meter with rotatable arcuate scale |
May. 18, 1976 |
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