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:
Jul. 07, 1987
Filed:
Feb. 11, 1985
Applicant:
Inventors:
Takehiro Nakamura, Nishio, JP;
Susumu Sato, Okazaki, JP;
Tadashi Hattori, Okazaki, JP;
Teiichi Nabeta, Okazaki, JP;
Minoru Kato, Ichinomiya, JP;
Assignees:
Nippondenso Co., Ltd., Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
250574 ; 2502 / ; 2502 / ;
Abstract
In a photo-electric smoke detector device, a first photo-detector receives the light emitted from a light emitter and scattered by smoke, and a second photo-detector directly receives the light emitted from the light emitter. The second photo-detector has an element surface on which trimmed electrodes are arranged. The electrodes of the second detector act to limit the amount of light emitted from the light emitter and transmitted to the elements of the second detector.