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:
Jun. 12, 2012
Filed:
Sep. 28, 2009
Steven Ian Bennett, Middlesex, GB;
Don Brighenti, Westminster, MA (US);
Joe Piccolo, Fitzwilliam, NH (US);
Kimberly Babineau, Greenfield, MA (US);
Steven Ian Bennett, Middlesex, GB;
Don Brighenti, Westminster, MA (US);
Joe Piccolo, Fitzwilliam, NH (US);
Kimberly Babineau, Greenfield, MA (US);
SimplexGrinnell LP, Westminster, MA (US);
Thorn Security Limited, Sunbury-on-Thames, Middlesex, GB;
Abstract
A detector comprises a detector base and a sensor, first and second resistors connected in series, a DC voltage source (Vref) connected to the resistors, and means for monitoring the voltage at the midpoint of a potential divider constituted by the series-connected resistors. The first and second resistors are rated so that the midpoint voltage is indicative of the date of manufacture of the sensor.