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. 16, 1981
Filed:
May. 21, 1979
Applicant:
Inventor:
Terence G Giles, Coulsdon, GB;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340572 ; 340539 ; 340568 ;
Abstract
A merchandise security system in which a signal having a first frequency is generated and is multiplied or divided by n to provide a signal having a second frequency which is transmitted. A responder circuit in a tag on the merchandise divides or multiplies the transmitted signal by n and transmits it to a receiver where it is compared with the originally generated first frequency and is used to produce an alarm signal.