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. 29, 1981
Filed:
Apr. 21, 1980
Applicant:
Inventors:
Eiichi Fukada, Fujimi, JP;
Takeo Furukawa, Niiza, JP;
Munehiro Date, Tokyo, JP;
Toshiaki Takamatsu, Tokyo, JP;
Ken'ichi Nakamura, Iwaki, JP;
Assignees:
Rikagauku Kenkyusho, Wako, JP;
Kureha Kagaku Kogyo Kabushiki Kaisha, Nihohbashi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
526255 ; 264 22 ;
Abstract
A process for preparing polyvinylidene fluoride type (PVDF) films having highly stable piezoelectricity and pyroelectricity, by stretching PVDF films, while causing corona discharge, across the electric field formed by discharging, to effect thereby to polarization of film.