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:
Apr. 04, 2006
Filed:
Feb. 19, 2004
Nobuharu Tahara, Ibaraki, JP;
Toshiyuki Kawashima, Ibaraki, JP;
Nobuharu Tahara, Ibaraki, JP;
Toshiyuki Kawashima, Ibaraki, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A method of forming a composite insulating layer in which a thin and uniform adhesive layer can be formed, and an adhesive strength between an adhesive layer and a porous layer is sufficient, a insulating layer obtained by the formation method, and a process of producing a wiring board, wherein an insulating layer is formed by the formation method, are disclosed. The method of forming a composite insulating layer includes a step of forming an adhesive layercontaining a partially imidated polyamic acid on a metallic foil; a step of applying a solutioncontaining a polyamic acid to the surface of the adhesive layer; a step of subjecting the coated solutionto phase separation to form a porous layer; and a step of subjecting the adhesive layerand the porous layerto imide conversion.