Composite fiberboard and process of manufacture
US5277762A · kind A · utility
57Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Apr 24, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A novel composite board of mineral wool, perlite, and cellulosic newsprint fibers for use as an acoustical tile is disclosed. The board displays a high porosity, a fine pore structure, a low density gradient through its thickness and an acceptable strength. The board is manufactured by a process that includes a flotation step prior to the final formation step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.