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:
Jan. 13, 2004
Filed:
Sep. 06, 2001
Shunsaku Nakauchi, Mitaka, JP;
Masanori Hirasawa, Tokorozawa, JP;
Kokusai Gijutsu Kaihatsu Kabushiki, Tokyo, JP;
Abstract
A flame sensor capable of being easily produced and accurately detecting a flame includes a broadband filter having a transmission band inclusive of a line spectrum of resonance radiation of a carbonic acid gas, a narrowband filter permitting the passage of only the line spectrum of the resonance radiation of the carbonic acid gas and having its band center not coincident with that of the broadband filter, a light reception device, amplifiers, a circuit for computing the difference of mean intensities of spectrums transmitting through the filters and passing through the amplifiers, and a circuit for raising an alarm when the output of the computation circuit exceeds a predetermined value.