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. 28, 2002
Filed:
Dec. 07, 2000
Applicant:
Inventors:
Noriaki Kudo, Kanuma, JP;
Minoru Nagashima, Kanuma, JP;
Assignee:
Sony Chemicals Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 1/508 ; H05K 1/03 ;
U.S. Cl.
CPC ...
B32B 1/508 ; H05K 1/03 ;
Abstract
A flexible printed substrate is constituted of metallic foil and provided thereon a polyimide layer which is produced by forming a film of a polyamic acid varnish on the metallic foil, followed by imidating. The polyimide layer has a linear expansion coefficient of 10×10 to 30×10 (1/K) and a softening point not more than the imidation temperature.