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:
Mar. 15, 1977
Filed:
Dec. 05, 1975
Applicant:
Inventor:
Eugene Phillips, Diamond Bar, CA (US);
Assignee:
General Dynamics Corporation, Pomona, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
2041 / ; 204164 ; 156644 ; 29625 ; 29628 ; 174 685 ;
Abstract
A method for conditioning drilled holes in multilayer printed wiring boards by removing layers of smeared plastic and adhesive prior to metal plating through the holes for interconnecting conductive layers of the boards includes baking the drilled boards and etching the boards within a plasma reactor chamber, with a predetermined gas pressure, the plasma being created by an RF generator. At the end of a predetermined time period, the RF generator is deactivated and atmospheric air is admitted to the reactor chamber. The reactor chamber is then purged of gases and the printed wiring boards are removed.