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. 03, 1981
Filed:
Jul. 19, 1979
Alain Mathieu, Montelimar, FR;
Lafarge, S.A., Paris, FR;
Abstract
This material is an anorthite with an alumina skeleton of which the overall porosity is between 40 and 70% with a pore size such that the average diameter is between 0.75.mu. and 8.mu.. To obtain it, water is mixed with a mixture of aluminous and sillicoaluminous materials with at least 10% by weight of calcium sulphate, it is dried and calcined at 1000.degree. to 1400.degree. C. The starting materials are selected so that the final product essentially comprises CaO, SiO.sub.2 and Al.sub.2 O.sub.3 with, by an SiO.sub.2 /Al.sub.2 O.sub.3 weight ratio less than 2 and a CaO/Al.sub.2 O.sub.3 weight ratio less than 1. A preferred composition corresponds to point D of the diagram. Application to replace plaster in the manufacture of moulds for the sanitary industry.