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:
Dec. 07, 1982
Filed:
Mar. 18, 1981
Tsunehiro Tsukagoshi, Tokorozawa, JP;
Shinichi Yokozeki, Tokorozawa, JP;
Sumio Hagiwara, Tokorozawa, JP;
Masataka Uchidoi, Tokorozawa, JP;
Toshikazu Yoshino, Tokorozawa, JP;
Yasuyuki Arai, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
Vibratory elements for use in audio equipment are fabricated from a kneaded mixture comprising polypropylene and flaky graphite powder. The kneaded mixture is rolled into a sheet in which graphite flakes are oriented parallel to the surface, and the sheet is then formed into a desired shape, for example, a dome- or cone-shaped diaphragm and a cantilever, as by vacuum forming, air-pressure forming or press molding. The mixture may further include polymethyl methacrylate and/or rubber-like material. The elements are characterized by improved temperature resistance.