Composite material with acoustic absorption properties
US3952831A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1975 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Feb 25, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A composite material with acoustic absorption properties of the "sandwich" ype has a core of cellular structure between two skins substantially parallel one of which is cut-out by orifices while the other is devoid of orifices. The core is composed of a plurality of cells each of which extends from one skin to the other. A plurality of small plates, of material with high acoustic resistivity, are inserted into the cellular structure. Each plate has an active part contained in a plane substantially parallel to the skins, so that the active parts form, together, the equivalent of an intermediary wall of high acoustic resistivity dividing the cellular structure into two superposed layers each formed by a mass of sub-cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.