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:
Jul. 09, 1996
Filed:
Aug. 11, 1995
George E Maffey, Dana Point, CA (US);
David A Saar, Lawrenceville, NJ (US);
Raymond W Simpson, Hamilton Square, NJ (US);
Emhart Inc., Newark, DE (US);
Abstract
A door lock assembly comprising a lock plug having a key receiving opening, selectively operable light source for illuminating the key receiving opening, RF receiver for reproducing a received pulsed RF signal and means for determining whether the reproduced RF signal is within an acceptable range of asymmetric patterns of 'on' pulse times followed by 'off' times selected to include a plurality of different asymmetric patterns and means for operating the light source means for a selected period of time when the determining means determines that the reproduced RF signal is within acceptable range.