Environmental noise pollution reduction device of running road vehicle
US4060142A · kind A · utility
6Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1975 |
| Grant date | Nov 29, 1977 |
| Priority date | — |
| Expiry date | Nov 19, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R13/0838
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Engine noises directed to the bottom portion of an engine compartment are reflected from the surface of an under-cover partly closing the engine compartment bottom opening and thereafter absorbed by sound-absorbent material attached to the inner surface of the hood of the engine compartment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.