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:
Nov. 13, 1984
Filed:
Apr. 02, 1984
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, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; B44C / ; C03C / ;
U.S. Cl.
CPC ...
156640 ; 156642 ; 156644 ; 156664 ; 156345 ; 252 792 ;
Abstract
A method for etching a strip of iron-nickel alloy, such as invar steel, having etch-resistant stencils on opposite major surfaces thereof includes contacting the stencilled surfaces with a ferric-chloride etchant. The etchant is controlled (a) to contain not more than 5 molar percent nickel ion with respect to the total content of nickel and iron ions, (b) to have a specific gravity greater than about 1.495 (48.degree. Baume) (c) and to have a temperature greater than 70.degree. C.