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. 17, 1977
Filed:
Aug. 25, 1975
Applicant:
Inventors:
Bryan Shaw, Runcorn, EN;
Neil Winterton, Runcorn, EN;
Assignee:
Imperial Chemical Industries Limited, London, EN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
65 3 / ; 65 3 / ; 65 6 / ; 427384 ; 4274 / ;
Abstract
A process for strengthening or toughening a phosphate glass the process comprising contacting the surface of the phosphate glass with a solution of a carboxylic acid in a liquid diluent, the carboxylic acid comprising an amino-carboxylic acid, or a hydroxy-carboxylic acid, or a mixture of an amino-carboxylic acid and a hydroxy-carboxylic acid. Particularly useful is an aqueous solution of an amino-polycarboxylic acid.