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:
Aug. 15, 1978
Filed:
Feb. 09, 1977
Applicant:
Inventors:
Gian Paolo Gambaretto, Padua, IT;
Vittorio Gottardi, Venice, IT;
Assignee:
Industrie Zignago S. Margherita S.p.A, Fossalta Di Portogruaro (Venice), IT;
Primary Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
428428 ; 65 31 ; 65 6 / ;
Abstract
In the method for the removal of alkalies from glass surfaces and articles by reaction with hydrofluoric acid, the glass surface is contacted with a gas stream containing a compound of fluorine and silicium, preferably silicium tetrafluoride, and water in a predetermined ratio, the treatment being carried out at high temperature. Depending on the treatment conditions, a deposition of finely divided silica onto the glass surface under treatment can be obtained.