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:
Sep. 21, 1999
Filed:
Apr. 30, 1996
Koju Okazaki, Fukuoka, JP;
Chitoshi Shimakawa, Fukuoka, JP;
Mamoru Tanaka, Fukuoka, JP;
Yoshinobu Kanemura, Fukuoka, JP;
Teruyuki Nagata, Fukuoka, JP;
Yoshihiro Irizato, Kanagawa, JP;
Shinichi Umeda, Fukuoka, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
A composition for polysulfide-based resin comprising a polythiol having 4 or more functional groups and a compound having a reactive unsaturated bond(s) and/or b epoxy group(s) and/or c iso(thio)cyanato group(s) in one molecule (however, a+b+c.gtoreq.2, and a and b are not simultaneously 0). A polysulfide-based resin obtained by curing the composition, an optical material comprising the resin, a lens consisting of the optical material and a method for producing the polysulfide-based resin are also set forth.