Acoustic filter and method of manufacturing
US11804205B2 · kind B2 · utility
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2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2016 |
| Grant date | Oct 31, 2023 |
| Priority date | — |
| Expiry date | Jan 27, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/768
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection moulded acoustic filter comprising a foil piece or filter structure having a plurality of micro-slits configured to act as acoustic channels through the foil piece for filtering sound waves impinging the foil piece. The micro-slits have a maximum slit width across a surface of the foil piece of less than one hundred micrometres and a combined slit length along the surface of the foil piece of at least five millimetres. An earplug comprising the acoustic filter. A method and mould for manufacturing the acoustic filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.