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. 14, 1990
Filed:
Oct. 03, 1989
Naoyuki Amaya, Higashiarai, Yatabemachi, Tsukuba-gun, Ibaraki-ken, JP;
Keizo Anan, Higashiarai, Yatabemachi, Tsukuba-gun, Ibaraki-ken, JP;
Yoshishige Murata, Sakuramura Umezono, Niihari-gun Ibaraki-ken, JP;
Takao Mogami, Owa, Suwa-shi, Nagano-ken, JP;
Yoshio Sano, Owa, Suwa-shi, Nagano-ken, JP;
Haruhiro Ikebe, Higashiarai, Yatabemachi, Tsukuba-gun, Ibaraki-ken, JP;
Rumiko Seita, Sakaecho, Yuki-shi, Ibaraki-ken, JP;
Other;
Abstract
A transparent optical article is constituted of an optical resin. The optical resin in obtained by polymerizing a feed monomer containing at least a diester of unsaturated dicarboxylic acid selected from the group consisting of itaconic acid, citraconic acid and mesaconic acid. The ester group forming the diester is ##STR1## or R, wherein X represents a halogen atom, m represents zero or an integer of 1 to 5 and R represents an alkyl group having 1 to 12 carbon atoms, an alkenyl group having 1 to 12 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms. At least one of the ester groups has an aromatic ring defined above.