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:
Aug. 19, 1980
Filed:
Jul. 12, 1978
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; C09K / ; C23F / ;
U.S. Cl.
CPC ...
156656 ; 156659 ; 156664 ; 156668 ; 156901 ; 427 96 ; 252 791 ; 430311 ; 430313 ; 430315 ; 430318 ; 430319 ;
Abstract
A semiconductor device fabricated by forming a layer of cured polyimide resin on a semiconductor body, forming a photoresist layer having a prescribed pattern on said cured layer, immersing in an etchant consisting of hydrazine and ethylenediamine to said cured layer through said prescribed pattern, whereby said cured layer is precisely etched according to said prescribed pattern and prescribed surfaces of said semiconductor body are exposed, forming a metal layer on the surface of said polyimide and the prescribed surfaces of said body, and selectively etching said metal layer so as to form a prescribed pattern.