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:
May. 24, 2011
Filed:
Mar. 26, 2010
Masao Iguchi, Tokyo, JP;
Kanji Numao, Tokyo, JP;
Masao Iguchi, Tokyo, JP;
Kanji Numao, Tokyo, JP;
Fenwal Controls of Japan, Ltd., Tokyo, JP;
Abstract
A photoelectric smoke detector may detect presence of smoke by utilizing a light emitting element and a light receiving element whose optical axes intersect with each other. The photoelectric smoke detector may include a casing for storing the light emitting element and the light receiving element. Inlet and outlet ports may be respectively provided in one and the other sides of the casing, the inlet and outlet ports bringing air flow into the casing. Rectifying light blocking means may be provided contiguously with each of the inlet and outlet ports, the rectifying light blocking means preventing entry of disturbance light into an interior space and forming a flow line of smoke extending from one or the other inlet and outlet port to the other or the one inlet and outlet port such that the flow line passes through a detection area by the light emitting element and the light receiving element.