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. 18, 1980
Filed:
Mar. 20, 1978
Applicant:
Inventors:
Mitsuo Kotaka, Musashino, JP;
Hirotoshi Ishikawa, Musashino, JP;
Kaisuke Muraki, Musashino, JP;
Ryo Takahashi, Musashino, JP;
Tamizo Matsuura, Musashino, JP;
Assignee:
Yokogawa Electric Works, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250343 ; 250352 ;
Abstract
A metallic block has a conical measuring-light inlet port and a conical reference-light inlet port formed therein. The ports intersect at a light sensor. The inlet ports are closed by respective multilayer interference filters. Temperature control means, which may be responsive to the light sensor output, maintains the metallic block, and thus the filters and sensor, at a fixed temperature.