The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1991
Filed:
Jun. 04, 1990
Applicant:
Inventors:
Lee K Stranjord, Burlington, MA (US);
Yellapu Anjan, Scottsdale, AZ (US);
Assignee:
Honeywell Inc., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; G01R / ; G01B / ;
U.S. Cl.
CPC ...
25022719 ; 25022721 ; 356345 ; 324244 ;
Abstract
A proximity switch for use with a single optical source of energy. A passive fiber-optic magnetometer includes a Michelson type magnetometer in which one of the legs is sensitized to magnetic fields. A fiber-optic data link connects the magnetometer to the single optical source of energy and to a photo detector. A permanent magnet positioned adjacent the magnetometer causes constructive interference which is detected by the photo detector.