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:
Feb. 05, 1985
Filed:
Dec. 20, 1983
Applicant:
Inventor:
Norvell J Nelson, Palo Alto, CA (US);
Assignee:
Psi Star, Inc., Hayward, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; B44C / ; C03C / ; C03C / ;
U.S. Cl.
CPC ...
1566591 ; 156656 ; 156664 ; 156666 ; 156902 ; 252 792 ; 252 794 ;
Abstract
Nitrogen dioxide process for etching copper and other metals, using water as a catalyst/solvent. In one disclosed embodiment, a film of water is formed on the surface of the metal, and the water-covered metal is exposed to gaseous NO.sub.2 to dissolve the metal. In another embodiment, the metal is exposed to an aqueous solution of NO.sub.2 or HNO.sub.3 in water, either by immersion or by spraying, to remove the metal.