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:
Nov. 20, 2012
Filed:
Oct. 05, 2009
Applicants:
Peter Lance, Mississauga, CA;
Gordon Ferch, Etobicoke, CA;
Inventors:
Peter Lance, Mississauga, CA;
Gordon Ferch, Etobicoke, CA;
Assignee:
Pratt & Whitney Canada Corp., Longueuil, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B 17/12 (2006.01); G01F 1/68 (2006.01); H05B 1/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fire detection switch for use in a fire detection circuit of a aircraft engine, having: a first resistor and a second resistor disposed in series between a common terminal and an alarm terminal; and a thermally-sensitive element having a different resistance at low temperature than at high temperature, the thermally-sensitive element disposed in series with the second resistor and in parallel with the first resistor.