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:
Jun. 21, 1988
Filed:
Mar. 05, 1987
Applicant:
Inventor:
Norman L Stauffer, Englewood, CO (US);
Assignee:
Honeywell Inc., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354403 ; 356-1 ; 356-4 ;
Abstract
A device for measuring the distance to a surface comprising first and second energy emitting sources positioned at two different distances with respect to the surface and driven by a signal which is of common frequency, but which is of different phase from one another. The beams produced by the two energy sources are reflected from the surface and the resultant vector sum of the beams received by an energy responsive detector is used to produce a resultant signal which has a phase that varies with the distance to the remote surface.