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:
Feb. 26, 2008
Filed:
Sep. 17, 2001
Applicants:
Karikath Sukumar Varma, Southport, GB;
John Richard Holland, Ormskirk, GB;
David William Holden, Wigan, GB;
Inventors:
Karikath Sukumar Varma, Southport, GB;
John Richard Holland, Ormskirk, GB;
David William Holden, Wigan, GB;
Assignee:
Pilkington plc, St. Helens, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C 17/00 (2006.01); C03C 27/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Process for the production of an intumescent fire resistant layer by drying a waterglass solution on the surface of a glass substrate are carried out in the presence of a salt of a carbonic acid or an α-hydroxy carboxylic acid such as potassium citrate. The drying is preferably carried out at a rate which reduces of pH of the solution by no more than 2 units during an initial drying period of 5 hours. The resulting interlayers provide improved fire resistance.