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. 07, 2010
Filed:
Dec. 06, 2005
Applicants:
Ryusuke Tanaka, Ichihara, JP;
Minoru Suzuki, Chiba, JP;
Inventors:
Ryusuke Tanaka, Ichihara, JP;
Minoru Suzuki, Chiba, JP;
Assignee:
Hitachi Chemical Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08L 63/00 (2006.01); C08L 67/02 (2006.01); H01L 23/29 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a process for producing an acid anhydride-based epoxy resin curing agent, an acid anhydride-based epoxy resin curing agent, an epoxy resin composition, and a cured product and optical semiconductor device using the same. The process for producing an acid anhydride-based epoxy resin curing agent according to the present invention comprises heating a mixture containing a polyvalent carboxylic acid anhydride and a polyester resin in the presence of hydrogen gas and a hydrogenation catalyst.