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:
Oct. 10, 1989
Filed:
Nov. 13, 1987
Jeffery L Barrall, Lancaster, PA (US);
Robert C Garman, Lancaster, PA (US);
Armstrong World Industries, Inc., Lancaster, PA (US);
Abstract
Phosphate reactive sheets and substrates can be prepared using wet-laying and dry-laying techniques. The wet or dry-laid composition contains calcium silicate and a non-reactive matrix of either fiber or a mixture of fiber and a binder. The matrix is used in an amount effective to hold the wet or dry-laid material together. At a desired time such phosphate reactive substrate compositions can be contacted with aqueous solutions of phosphoric acid. A metal oxide selected from aluminum oxide, magnesium oxide, zinc oxide, and calcium oxide must be present in either the substrate, the solution, or both. After the solution contacts the substrate, a reaction takes place within the matrix to form a rigid article.