Sound absorber
US3997020A · kind A · utility
Inventors
Key dates
| Filing date | Oct 29, 1974 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Oct 29, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2490/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A sound absorber comprises an acoustical horn whose mouth is turned towards a source of sound the radiation of which is to be deadened or absorbed and at its narrow throat is provided with a small plug sound-absorbing material of selected acoustical impedance. Such a unit can be made of hard construction material such as plaster or concrete, wood or metal and fiberglass or rock wool of predetermined density may be employed as the sound absorber at the narrow throat of the horn. The horn is preferably of exponential shape. Two absorbers of this kind facing each other can be used as building block of a double shell sound attenuating wall, with high sound transmission loss (STL).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.