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:
May. 27, 2003
Filed:
Oct. 29, 2001
Applicant:
Inventors:
Takashi Yamaji, Tokyo, JP;
Mamoru Komatsu, Tokyo, JP;
Assignee:
Sumitomo Bakelite Company Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B 3/00 ;
U.S. Cl.
CPC ...
B32B 3/00 ;
Abstract
A prepreg exhibiting excellent formability and producing laminated boards and multiple layer circuit boards exhibiting high thickness precision is disclosed. The prepreg comprises an inner layer made from a glass fiber substrate, having a weight of 40 g or more and less than 115 g per square meter and an air permeability or 20 cm /cm /sec or less, impregnated with an epoxy resin, and an outer layer of an epoxy resin coating provided on at least one side of the inner layer, wherein the epoxy resin reaction rate in the inner layer is 85% or more and the epoxy resin reaction rate in the outer layer is 60% or less.