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:
Jul. 19, 2016
Filed:
Jun. 19, 2007
Masahiko Nakamori, Shiga, JP;
Satoshi Maeda, Shiga, JP;
Tooru Kitagawa, Shiga, JP;
Hisato Kobayashi, Shiga, JP;
Yasuo Ohta, Shiga, JP;
Masahiko Nakamori, Shiga, JP;
Satoshi Maeda, Shiga, JP;
Tooru Kitagawa, Shiga, JP;
Hisato Kobayashi, Shiga, JP;
Yasuo Ohta, Shiga, JP;
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
A non-woven fabric which is excellent in thermal resistance, mechanical strength, and thermal dimensional stability for applications exposed to high temperature circumstance and has an extremely large surface area and exhibit an excellent filter performance is obtained. The non-woven fabric is composed of polyimide fibers which are obtained by polycondensation of at least an aromatic tetracarboxylic acid and an aromatic diamine having a benzoxazole structure and have a fiber diameter in the range of 0.001 μm to 1 μm. The non-woven fabric is obtained by the steps of preparing a polyamic acid by polycondensation of an aromatic tetracarboxylic acid and an aromatic diamine having a benzoxazole structure, and electro-spinning the polyamic acid to form a polyimide precursor non-woven fabric; and imidizing a polyimide precursor fiber bundle.