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:
Feb. 14, 2017
Filed:
Feb. 13, 2015
Siemens Schweiz Ag, Zurich, CH;
Hans Aebersold, Bonstetten, CH;
Siemens Schweiz AG, Zurich, CH;
Abstract
An optical smoke alarm contains a detector unit that works according to the scattered light principle with a light-emitting diode to irradiate particles to be detected and a photo sensor which is spectrally sensitive thereto to detect the light scattered by the particles. The light-emitting diode contains a first LED chip being a surface-emitting radiator for emitting a first light bundle with light in a first wavelength range of from 350 nm to 500 nm. It contains a second LED chip being a surface-emitting radiator for emitting a second light bundle with light in a second wavelength range of from 665 nm to 1000 nm. The two LED chips are arranged next to each other. A ratio of the optically active surface of the first LED chip to the optically active surface of the second LED chip is within a range of from 2 to 20.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile