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:
Oct. 27, 2015
Filed:
May. 01, 2014
Applicant:
Panasonic Corporation, Osaka, JP;
Inventor:
Yohei Jin, Mie, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 9/04 (2006.01); H04R 9/06 (2006.01); H04R 7/04 (2006.01); H04R 9/02 (2006.01); H04R 31/00 (2006.01); H04R 9/00 (2006.01); H04R 7/00 (2006.01); D21H 17/00 (2006.01); D21H 21/00 (2006.01);
U.S. Cl.
CPC ...
H04R 9/025 (2013.01); H04R 7/04 (2013.01); H04R 31/003 (2013.01); H04R 2307/021 (2013.01);
Abstract
After beaten, pulp is mixed with a filler to obtain a mixture of the pulp and the filler. Additives are added to the mixture, which is made into pater and then hot-pressed. The filler content of the mixture is in the range of 20 wt % to 80 wt %. After the additives are added, a polymeric viscosity improver with high viscosity is added to produce a narrow diaphragm or a thin compact diaphragm with high aspect ratio. These diaphragms have high rigidity and a wide reproduction frequency range.