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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.:

US 4221773 B1

PDFFull Text
Date of Patent:
Sep. 09, 1980

Filed:

Dec. 13, 1978

Method of producing a carbon diaphragm for an acoustic instrument

Applicant:
Inventors:

Tsunehiro Tsukagoshi, Tokyo, JP;

Teruo Toma, Tokyo, JP;

Shinichi Yokozeki, Tokyo, JP;

Toshikazu Yoshino, Tokyo, JP;

Assignee:

Pioneer Electronic Corporation, Tokyo, JP;

Attorney:

Armstrong, Nikaido, Marmelstein & Kubovcik

Primary Examiner:

Edward J Meros

Int. Cl.
CPC ...
C01B / ; G10K / ;
U.S. Cl.
CPC ...
423445 ; 181167 ; 264 291 ; 264 297 ; 423448 ; 423449 ;
Abstract

A method of producing a diaphragm of an acoustic instrument having the steps of blending powders of carbon such as graphite, carbon black or the like and a thermoplastic or a thermosetting resin, shaping the resultant blend into a desired form and then carbonizing the shaped blend. As a result, it has become possible to produce a diaphragm of an acoustic instrument, having a light weight, high rigidity and a large ratio of Young's modulus to density.

Find Patent Forward Citations

Tsukagoshi, Tsunehiro. (1980). Method of producing a carbon diaphragm for an acoustic instrument (U.S. Patent No. 4221773). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4221773

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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