Noise silencing systems
US4785909A · kind A · utility
10Cited by
6References
18Claims
0Family size
Inventor
Key dates
| Filing date | Dec 3, 1985 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Dec 3, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B1/04
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A silencer device having a substantially aperiodic (non-frequency-dependent) silencing action is provided. The silencer is of the flow type comprising an elongate chamber generally defining or surrounding an unobstructed fluid transmission path. The chamber is principally occupied by fluid having a predetermined characteristic impedance and is provided at both ends with acoustic energy absorbing means for providing acoustic impedance type terminations to said chamber, the acoustic impedance of the terminations being substantially equal to the characteristic impedance of the fluid in the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.