Patent · US Expired

Method and apparatus for producing a multilayer cementitious product

US8968621B2 · kind B2 · utility

0Cited by

12References

17Claims

0Family size

Assignee

BPB Limited · GB

Inventors

Winfried Johannes Josef Spikermann · Bodenwerder, DE
Kane Ironside · Shanghai, CN

Key dates

Filing date	Jun 23, 2004
Grant date	Mar 3, 2015
Priority date	—
Expiry date	Aug 30, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31996
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Gypsum plasterboard is produced by combining calcium sulphate hemihydrate (stucco) with water to form an aqueous slurry. Uncalcined gypsum having a specific surface area below 0.3 m2/g is added to the slurry and the slurry is discharged onto a support so as to form a sheet of gypsum plasterboard.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.