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. 20, 1982
Filed:
Mar. 04, 1980
Henry Lipschitz, Atlantic Beach, NY (US);
Permag Corporation, Hicksville, NY (US);
Abstract
A magnetic decoupler for use with an antitheft device is disclosed. In one preferred embodiment, the decoupler includes a composite permanent magnet comprising an annular permanent magnet that may be of ceramic and a second, preferably disc-shaped permanent magnet, which is preferably more strongly magnetized than the annular magnet and which preferably comprises a rare earth element. The two magnets are coaxially aligned with but axially displaced from each other and are oriented with the opposite polarity so as to create a region of especially great magnetic flux in the bore of the annular magnet. A cover plate, preferably of cold-rolled steel, may be provided adjacent the face of the annular magnet that is remote from the second magnet to further concentrate the flux in the bore.