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:
Jan. 08, 1991
Filed:
Jul. 06, 1989
Applicant:
Inventors:
Elric W Saaski, Bothell, WA (US);
Dale M Lawrence, Lynnwood, WA (US);
Assignee:
MetriCor Inc., Woodinville, WA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; G01D / ;
U.S. Cl.
CPC ...
25022727 ; 25023119 ; 25022723 ;
Abstract
A variable gap optical sensor device with a pair of opposed reflective surfaces and having a periodic response function. The sensor includes stiffening means or limiting means intermediate the reflective surfaces to diminish the potential variation in the gap between the reflective surfaces and thereby increase the monotonic range of the periodic response function, resulting in a dual stage sensor response function with a second stage having an increased period.