Boards
US4551384A · kind A · utility
53Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1984 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | May 25, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249987
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A board of sandwich construction which comprises two outer preformed support membranes consisting of or comprising fibrous material, the said membranes having interposed therebetween an aerated intermediate layer comprising at least 70% by weight based on the dry board of an unfired clay which contains less than 20% by weight of expandable minerals and the intermediate layer also including fibres therein. The boards of the present invention are intended mainly for use as plasterboard substitute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.