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:
Oct. 06, 1981
Filed:
Jan. 24, 1979
Applicant:
Inventor:
Kaspar Weingand, Durnbach, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Primary Examiner:
Int. Cl.
CPC ...
B23P / ; B23P / ; B44C / ; C03C / ;
U.S. Cl.
CPC ...
156644 ; 65 31 ; 156656 ; 156657 ; 1566591 ; 156663 ; 252 793 ;
Abstract
A perforated glass plate for use in gas discharge display devices is produced by providing an etch-resistant coating in a select pattern on surfaces of a glass plate so that areas to be perforated are coating-free, subjecting the so-coated glass plate to a gaseous hydrofluoric acid, obtained from concentrated hydrofluoric acid, for a period of time sufficient to etch fine sized perforations, for example holes, through the plate and rinsing the etched plates.