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:
Sep. 24, 1985
Filed:
May. 17, 1984
Applicant:
Inventor:
Norvell J Nelson, Palo Alto, CA (US);
Assignee:
PSI Star, Hayward, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; B44C / ; C03C / ; C03C / ;
U.S. Cl.
CPC ...
156656 ; 1566591 ; 156666 ; 156902 ; 156904 ; 156345 ; 20412965 ; 252 792 ;
Abstract
Process and apparatus for anisotropically etching copper through a nickel-gold mask on a circuit board. An electrical connection is made between the copper and the reactor wall or another electrical conductor contacted by the etching solution. The copper is removed anisotropically, without undercutting or lateral etching of the copper beneath the nickel-gold mask.