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. 14, 1992
Filed:
Feb. 25, 1991
Applicant:
Inventor:
Gerd Rauscher, Alzenau, DE;
Assignee:
Vacuumschmelze GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340551 ; 340572 ;
Abstract
A deactivatable anti-theft security strip has a soft-magnetic constituent and a hard-magnetic constituent. The hard-magnetic constituent is used for two purposes. It is used first to stress the soft-magnetic constituent and thereby to promote a fast magnetic reversal, and it is also used to deactivate the strip by magnetization. The pre-stressed, soft-magnetic constituent produces defined, steep pulses even in the presence of a slow magnetic reversal, so that the anti-theft security strip is especially suited for alternating fields having low frequencies, for example 50 or 60 Hz.