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. 31, 1999
Filed:
Jan. 13, 1997
Applicant:
Inventors:
Akikazu Amagi, Tokyo, JP;
Nobuyuki Uemura, Chiba-ken, JP;
Motoharu Takeuchi, Tokyo, JP;
Kenichi Takahashi, Chiba-ken, JP;
Minoru Ohashi, Chiba-ken, JP;
Hiroshi Horikoshi, Chiba-ken, JP;
Masanori Shimuta, Tokyo, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528373 ; 528 96 ; 528 99 ; 528380 ; 528393 ;
Abstract
An episulfide which has an alicyclic, aromatic or heterocyclic skeleton and has two or more moieties represented by the formula ##STR1## wherein X is S or O, and S is in an amount of 50% or more, on the average, of the total of S and O constituting a three-membered ring. A cured material obtained by polymerizing this episulfide compound is a desirable optical material for various uses, particularly as a lens material for spectacles.