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:
Apr. 14, 2025
Filed:
Mar. 30, 2021
Applicant:
Foster Electric Company, Limited, Tokyo, JP;
Inventors:
Yusuke Sai, Tokyo, JP;
Hirotsugu Nakayama, Tokyo, JP;
Assignee:
FOSTER ELECTRIC COMPANY, LIMITED, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04R 31/00 (2005.12); H04R 7/12 (2005.12);
U.S. Cl.
CPC ...
H04R 31/003 (2012.12); H04R 7/125 (2012.12); H04R 2307/021 (2012.12); H04R 2499/13 (2012.12);
Abstract
A diaphragm for an electroacoustic transducer includes a paper substrate containing cellulose fibers as a main component and is configured such that a first surface region with a predetermined thickness from a first surface of the paper substrate has a greater total amount of coloring particles than a second surface region with a predetermined thickness from a second surface of the paper substrate, the second surface being opposite to the first surface.