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:
Apr. 30, 2024
Filed:
Mar. 10, 2020
Nohmi Bosai Ltd., Tokyo, JP;
Masamichi Uchida, Tokyo, JP;
Takahiro Noguchi, Tokyo, JP;
Taizo Matsuda, Tokyo, JP;
Tomohiro Kato, Tokyo, JP;
Kenji Mizutani, Tokyo, JP;
Takahiro Kaneko, Tokyo, JP;
Takahiro Watanabe, Tokyo, JP;
NOHMI BOSAI LTD., Tokyo, JP;
Abstract
A smoke detector includes: a casing; a first light emitting unit; a second light emitting unit; and a light receiving unit. A second scattering angle that is an angle between the reception axis of the light receiving unit and a second extension extending from an intersection of the second emission axis and the reception axis in a direction away from the second light emitting unit is larger than a first scattering angle that is an angle between the reception axis of the light receiving unit and a first extension extending from an intersection of the first emission axis and the reception axis in a direction away from the first light emitting unit.