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. 31, 1978
Filed:
Sep. 07, 1976
Applicant:
Inventor:
Park French, Aurora, OH (US);
Assignee:
Sterndent Corporation, Mount Vernon, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
356188 ; 356 93 ; 356212 ; 362 32 ;
Abstract
A comparison type colorimeter concentrates unknown and reference light beams onto the same surface area portion of a single photosensor and additionally filters the unknown and reference light beams by the same color filters and, preferably, portions thereof. Moreover, an enclosed light source produces light for the colorimeter to eliminate shift in illumination due to dust accumulation on the lamp and/or reflector of the light source.