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. 09, 2002
Filed:
Feb. 19, 1999
Applicant:
Inventors:
Masahiro Komachiya, Hitachi, JP;
Takao Miwa, Hitachinaka, JP;
Rintaro Minamitani, Tsukuba, JP;
Takayuki Fumino, Hitachinaka, JP;
Tatsunori Sakaguchi, Hitachinaka, JP;
Shizuhisa Watanabe, Hitachinaka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/02 ; G02B 6/00 ;
U.S. Cl.
CPC ...
G02B 6/02 ; G02B 6/00 ;
Abstract
An optical fiber comprising an optical fiber main body and a coat formed therearound and made from a polyimide resin obtained by using as an acid component a tetracarboxylic dianhydride having at least two benzene rings fused or bound directly or via an oxygen atom has excellent resistance to high temperature and high humidity and adhesiveness to the optical fiber main body, and useful in a sensing part in a fiber-optic sensing system comprising at least one sensing part and signal transmitting paths.