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Class Information
Number: 33/272
Name: Geometrical instruments > Straight-line light ray type > With magnetic compass
Description: Device including means responsive to an external magnetic field, usually that of the earth, for indicating direction.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7411512 |
Tracking the geographic location of an animal |
Aug. 12, 2008 |
| 7197343 |
Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus |
Mar. 27, 2007 |
| 6094830 |
Inclination-compensating display device for a compass |
Aug. 1, 2000 |
| 5560114 |
Arrangement for compensating for magnetic declination in an optically readable bearing compass |
Oct. 1, 1996 |
| 5151753 |
Non-parallax optical sighting instrument |
Sep. 29, 1992 |
| 5046259 |
Underwater measuring systems and methods |
Sep. 10, 1991 |
| 4967479 |
Position relocation device |
Nov. 6, 1990 |
| 4899453 |
Compass with LED illumination |
Feb. 13, 1990 |
| 4894922 |
Hand bearing compass |
Jan. 23, 1990 |
| 4763419 |
Optical viewing system |
Aug. 16, 1988 |
| D290093 |
Compass |
Jun. 2, 1987 |
| 4594788 |
Light-tight combination micrographic map-reader protractor compass |
Jun. 17, 1986 |
| 4438568 |
Recreational compass |
Mar. 27, 1984 |
| 4402140 |
Telescope with compass |
Sep. 6, 1983 |
| 4395828 |
Combination geodetic transit compass and signal mirror |
Aug. 2, 1983 |
| 4241511 |
Method and apparatus for determining and recording boat compass deviation |
Dec. 30, 1980 |
| 4206842 |
Pyramid container device |
Jun. 10, 1980 |
| 4158260 |
Wrist compass and transit |
Jun. 19, 1979 |
| 4081912 |
Magnetic bearing plotting and sighting device |
Apr. 4, 1978 |
| 4020559 |
Bearing compass |
May. 3, 1977 |
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