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:
Jul. 15, 1986
Filed:
Apr. 16, 1985
Applicant:
Inventors:
Richard B Maynard, Colerain Township, Lancaster County, PA (US);
John J Moscony, Manheim Township, Lancaster County, PA (US);
Margaret H Saunders, East Lampeter Township, Lancaster County, PA (US);
Assignee:
RCA Corporation, Princeton, NJ (US);
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; B44C / ; C03C / ; C03C / ;
U.S. Cl.
CPC ...
156644 ; 156640 ; 156642 ; 1566611 ; 156345 ; 252 792 ;
Abstract
A method for etching an array of apertures through a carbon-steel sheet wherein, for each of the majority of said apertures, the ratio of the desired smallest cross-sectional dimension thereof to the thickness of said sheet is less than about 0.9, said sheet having etch-resistant stencils on opposite major surfaces thereof, said method comprising contacting said stencilled major surfaces with ferric chloride etchant having a specific gravity in a range at which a smooth finish is realized.