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:
Dec. 26, 1989
Filed:
May. 31, 1988
Applicant:
Inventors:
Richard N Leyden, Topanga, CA (US);
Robert Lawrence, Malibu, CA (US);
William E Elias, Redondo Beach, CA (US);
Assignee:
Hughes Aircraft Company, Los Angeles, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B44C / ;
U.S. Cl.
CPC ...
156630 ; 156644 ; 156652 ; 156656 ; 156668 ; 252 792 ; 134 221 ; 134 34 ;
Abstract
Methods for forming small diameter holes in polyimide/Kelvar.RTM. substrates utilize hot concentrated sulfuric acid and then honing, as necessary, with liquid abradant slurries to smooth uneven edges of the openings.