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. 23, 1993
Filed:
Jun. 15, 1992
Applicant:
Inventors:
Christopher R Paul, Bayport, NY (US);
David T Lundquist, Stonybrook, NY (US);
Assignee:
Knogo Corporation, Hauppauge, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340572 ; 307520 ;
Abstract
Signals received by an electronic article surveillance system are processed digitally to ascertain the variation in magnitude of successive signals and to prevent the actuation of an alarm when the variation exceeds a predetermined amount; and signals whose frequency components have been phase shifted from a filtering operation are restored by passing them into a signal delay circuit, tapping the delay circuit at several points therealong into associated signal channels selectively amplifying or attenuating the signal in each channel and combining the signals in each channel.