U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Magnetic compass

Patent 4175333 Issued on November 27, 1979. Estimated Expiration Date: Icon_subject May 16, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

1016732

2027952

2446568

3191306

Inventor

Assignee

Application

No. 05/906427 filed on 05/16/1978

US Classes:

33/344, With damper or governor for sensor33/355RMagnetic field responsive

Examiners

Primary: Martin, William D. Jr.

Attorney, Agent or Firm

International Classes

G01C 17/06 (20060101)
G01C 17/10 (20060101)
G01C 17/00 (20060101)

Abstract

A magnetic compass has been devised which is of the type having a pivot point displaced above the plane of the permanent magnets so that the distance of displacement of the pivot point with respect to the center of force will reduce the tilt angle or tipping otherwise caused by changes in latitude when the compass is to be operated in different parts of the world and a spherical needle bearing can be employed at the pivot point as a result of the increased pendular effect achieved by displacing the pivot point above the magnets. The need for a lift assembly to cushion the pivot point is eliminated while providing for an extremely rugged and versatile magnetic compass which will serve as a light, portable pocket transit capable of measuring horizontal and vertical angles as well as being used as a prismatic compass, level, clinometer, plumb or alidade.

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