Sound-absorbing material
US11932178B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 14, 2019 |
| Grant date | Mar 19, 2024 |
| Priority date | — |
| Expiry date | Jan 5, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2310/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention provides a sound-absorbing material having sound absorption performance with an average sound absorption coefficient of 0.70 or more in the frequency range of 800 to 5000 Hz. The present invention provides a sound-absorbing material including: a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more; and an inorganic material layer mainly containing a calcium-based material and having a thickness of 0.4 to 0.6 mm on the surface of the fiber layer, the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer, each hole having a depth corresponding to 50 to 90% of the thickness of the fiber layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.