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:
Mar. 31, 2009
Filed:
Mar. 17, 2005
Applicants:
Masaru Uryu, Chiba, JP;
Kunihiko Tokura, Tokyo, JP;
Inventors:
Masaru Uryu, Chiba, JP;
Kunihiko Tokura, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
D21F 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An acoustic paper diaphragm excellent in moisture resistance and acoustic characteristics and not impairing the biodegradability is provided. An acoustic paper diaphragm is formed of paper in which polylactide resin emulsion that is a biodegradable polymeric material is internally added as a sizing agent.