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:
Nov. 08, 1994
Filed:
Feb. 18, 1993
Applicant:
Inventor:
Shuji Takeshita, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428209 ; 528353 ;
Abstract
A thin film circuit board has an insulator layer and a conductor layer embedded in the insulator layer and supported in an undercut state by an insulator. The entire conductor layer, excluding the portion supported by the insulator, is surrounded by an insulator having a relatively low dielectric constant which in turn is surrounded by an insulator having a relatively high dielectric constant. The insulator portion that supports the conductor layer in the undercut state has a relatively high etching rate and is formed in a desired thickness on an insulator layer having a relatively low etching rate.