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:
Dec. 31, 2013
Filed:
May. 19, 2010
Applicants:
Robin Fisher, Loughborough, GB;
Henri Van Damme, Olivet, FR;
Inventors:
Robin Fisher, Loughborough, GB;
Henri van Damme, Olivet, FR;
Assignee:
BPB Limited, Coventry, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B 1/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of producing gypsum building board, in which there is added, to an aqueous gypsum slurry containing a water swellable clay, a basic water-soluble polymer having preferential affinity for clay. The slurry is allowed to set so as to form a board. The basic water-soluble polymer may be, for example, a polyvinyl alcohol or a polymer consisting essentially of carbon, nitrogen and hydrogen and having amine groups (which may be primary, secondary, tertiary or quaternary) in the polymer backbone and/or in side chains thereof.