False ceiling
US5740649A · kind A · utility
20Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1995 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Oct 19, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B2001/8495
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A false ceiling for buildings designed to absorb acoustic waves has perfoed plates. One or several suspended plates (1, 6) are provided which are so hard that they cannot vibrate. The plates have a plurality of regularly or irregularly arranged holes (4, 7) with 0.2-3 mm diameter, the surface of the holes being less than 4% of the total surface. The air in the holes (4, 7) forms with the overlying cavities (11) a dampening active mass system of the foil absorber type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.