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:
Jan. 27, 1987
Filed:
Dec. 09, 1985
Applicant:
Inventors:
Richard N Leyden, Topanga, CA (US);
Robert Lawrence, Malibu, CA (US);
Assignee:
Hughes Aircraft Company, Los Angeles, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; B29C / ; C03C / ; C23F / ;
U.S. Cl.
CPC ...
156644 ; 134 221 ; 134 2217 ; 156630 ; 156652 ; 156655 ; 156668 ; 156902 ; 252 795 ; 427 97 ;
Abstract
Methods for forming holes of predetermined size in polyimide substrates having metallic layers adhesively attached thereto include selectively removing areas of desired size and shape from the metallic layer; contacting the exposed adhesive layer with a selective etchant therefor that does not affect the polyimide substrate or undercut the adhesive near the opening formed; and selectively etching the polyimide substrate exposed in the openings by removal of the adhesive layer overlying the polyimides. These methods permit rapid, efficient formation of holes having a diameter as small as one mil (0.00254 cm).