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:
Aug. 08, 2023
Filed:
Mar. 01, 2018
Mitsui Chemicals, Inc., Tokyo, JP;
The School Corporation Kansai University, Suita, JP;
Yoshiro Tajitsu, Suita, JP;
Yuzo Nakamura, Chiba, JP;
Tomoya Matayoshi, Ichihara, JP;
Takayuki Watanabe, Chiba, JP;
Michio Eriguchi, Chiba, JP;
MITSUI CHEMICALS, INC., Tokyo, JP;
THE SCHOOL CORPORATION KANSAI UNIVERSITY, Suita, JP;
Abstract
An electretized film of the present invention includes a cyclic olefin polymer, in which the electretized film is a non-porous film, and a piezoelectric constant din a thickness direction, which is measured by applying a pressing force to the electretized film in the thickness direction, under conditions of a load of 0.5 N, a dynamic load of ±0.25 N, a frequency of 110 Hz, a temperature of 23° C., and a humidity of 50%, is equal to or more than 100 pC/N.