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:
May. 25, 1976
Filed:
Apr. 30, 1974
Applicant:
Inventors:
Kenji Nakagawa, Tokorozawa, JA;
Ko Itaya, Tokorozawa, JA;
Assignee:
Hoya Glass Works, Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ;
U.S. Cl.
CPC ...
106 52 ; 65 3 / ;
Abstract
A SiO.sub.2 -Al.sub.2 O.sub.3 -Na.sub.2 O-Li.sub.2 O glass which can be strengthened in a short time, typically in less than about thirty minutes, by an alkali metal ion exchange method to produce a high strength glass having an improved compressive surface layer of relatively large thickness can be obtained by substituting Li.sub.2 O for a portion of Na.sub.2 O content in a glass consisting essentially of SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, Li.sub.2 O and F.sub.2.