Compass
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 20, 1987
Issued Date -
N/A
app pub date -
Jul 31, 1986
filing date -
Jan 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compass which is self-compensating for dip of its pointer arms irrespective of variances in the earth's magnetic forces at different geographical locations includes a magnet disposed beneath respective proximal portions of the pointer arms so that the pointer arms are parallel to the magnetic field of the magnet, with the magnet constructed to be counterbalancing with regard to the earth's magnetic fields. In a preferred embodiment, the magnet comprises a plastic disk with magnetic particles embedded therein, the disk having a chordal portion removed therefrom immediately beneath one pointer arm, and a damper pan assembly is controlled by a lift arm to selectively dampen the movement of the pointer arms.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully