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:
Mar. 21, 1978
Filed:
Sep. 20, 1976
Applicant:
Inventor:
Bernard J Berg, Grand Rapids, MI (US);
Assignee:
Foresight Enterprises, Inc., Grand Rapids, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356202 ; 307230 ; 328145 ; 356206 ;
Abstract
The output of a test light of a densitometer is divided into a test beam and a reference beam. The test beam is caused to traverse film samples, and impinge on a detector that produces a signal responsive to the intensity of the received light. A second detector is arranged to receive the reference beam, which does not traverse the film sample. A measuring system is responsive to the output of the first detector, and utilizes the output of the second detector to compensate for variations in the intensity of the test light.