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:
Feb. 26, 1985
Filed:
Apr. 29, 1983
Applicant:
Inventors:
Joseph R Marchetti, Hempfield Township, Westmoreland County, PA (US);
Wilbur R Thomas, Hampton, SC (US);
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; H05K / ;
U.S. Cl.
CPC ...
428236 ; 428248 ; 428251 ; 428285 ; 428288 ; 428290 ; 428415 ; 428432 ; 428460 ; 428464 ; 4284774 ; 428458 ; 428416 ; 428436 ; 428530 ; 428901 ; 428920 ; 174 685 ;
Abstract
A prepreg useful in flame resistant copper clad printed circuit boards is made by impregnating a porous substrate with an impregnant containing: either a prebrominated epoxy resin or a mixture of a non-halogenated epoxy resin and flame retarding additive containing bromine, and phenolic hydroxyl groups. A phenolic novolac oligomer having an average of over 2.5 phenolic hydroxyl groups per oligomeric unit is used as curing agent. Optionally, a suitable catalyst may be included. The impregnated substrate is heated to cure or advance the resin to the 'B'-stage.