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:
Aug. 05, 1980
Filed:
Nov. 03, 1977
Applicant:
Inventors:
Hiroshi Takeuchi, Matsubara, JP;
Hideaki Inoue, Neyagawa, JP;
Hidetsugu Kawabata, Hirakata, JP;
Keizo Ishiwatari, Kobe, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
428607 ; 181168 ; 181170 ; 428615 ; 428621 ; 428627 ; 428649 ; 428650 ; 428651 ; 428660 ;
Abstract
A composite diaphragm for a speaker comprises a boron layer formed on a metal foil such as titanium foil, in which a layer of a low melting point metal such as aluminum or magnesium is interposed between the metal foil and the boron layer to provide high rigidity, high elasticity and high bonding strength between the metal foil and the boron layer.
Takeuchi, Hiroshi. (1980). Composite diaphragm for speaker (U.S. Patent No. 4216271). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4216271
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile