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. 05, 1983
Filed:
Oct. 24, 1980
Hendrik J Joormann, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Magnetic head and method of producing a magnetic head which is formed by a core assembled from two pole pieces. At least one layer of a non-magnetizable material which forms the useful gap is provided between the pole pieces. One embodiment of the method includes the step of deposition on the pole pieces by means of a sputtering method a layer of a glass which comprises 12-20% by weight of Al.sub.2 O.sub.3, 40-48% by weight of B.sub.2 O.sub.3 and a total of 35-45% by weight of one or more of the oxides BaO, CaO or SrO. Thereafter the pole pieces are pressed together, with the glass layers in contact, and bonded together by heating the glass to the softening point, followed by cooling.