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. 05, 1978
Filed:
Dec. 20, 1976
Applicant:
Inventors:
Assignees:
Sanyo Electric Co., Ltd., Moriguchi, JP;
Tokyo Sanyo Elctric Co., Ltd., Gunma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ; G10K / ; B32B / ;
U.S. Cl.
CPC ...
181167 ; 181170 ; 428 64 ; 428309 ; 428328 ;
Abstract
A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from nickel powder wherein a vinyl chloride sheet is disposed on the surface of the porous metal to eliminate the gas permeability of the porous metal.
Ishii, Yasuhiro. (1978). Diaphragm for speaker (U.S. Patent No. 4128138). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4128138
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile