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. 21, 1981
Filed:
Mar. 18, 1980
Kazuo Nakamura, Toyonaka, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A gapped bar is formed of a pair of rectangular parallelopiped magnetic core block having coil-winding grooves jointed to each other through a medium of a non-magnetic thickness. The gapped bar is provided with a plurality of non-magnetic glass mold parts disposed to limit at least the front gap portion to a predetermined track width. Then, a head core is formed by cutting the gapped bar at the glass mold parts at a predetermined angle to the longitudinal axis of the gapped bar and then effecting required processing such as finishing of the cut surface. Finally, an annealing is effected on thus formed head core at a temperature higher than the deformation point of the glass constituting the mold glass part.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile