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:
Oct. 13, 1992
Filed:
May. 28, 1991
Applicant:
Inventors:
Takaaki Okinaka, Ichihara, JP;
Kiyomi Sugawara, Ichihara, JP;
Hiromasa Kawai, Midland, MI (US);
Fumiaki Kanega, Ichihara, JP;
Assignee:
Hitachi Chemical Company, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526203 ; 526262 ; 528322 ;
Abstract
An optical resin obtained by polymerizing 97 to 50% by weight of methyl methacrylate, 3 to 30% by weight of an N-substituted maleimide, and 0 to 40% by weight of an unsaturated monomer by suspension polymerization at a pH of 5.5 to 7.5 is excellent in heat resistance and transparency.