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. 31, 2012
Filed:
Sep. 24, 2009
Tomohiro Hoshino, Tokyo, JP;
Takashi Ito, Tokyo, JP;
Katsuhiro Suzuki, Tokyo, JP;
Nohmi Bosai Ltd., Tokyo, JP;
Abstract
A photoelectric smoke detector is capable of preventing an erroneous alarm from being issued even when steam flows into a smoke detecting unit. The smoke detecting unit includes: an installation section; and a smoke inlet section. The installation section includes: a light emitting element for emitting light to an inside of the installation section; and a light receiving element for receiving the light emitted from the light emitting element. The smoke inlet section includes: a plurality of wall members for preventing external light from entering the smoke inlet section; and a smoke inlet formed between the plurality of wall members. The installation section and the smoke inlet section are arranged so as to overlap each other, with the smoke inlet section being positioned on a lower side of the installation section, and are communicated with each other through an opening.