Title:
Sound-absorbing panels with tapered holes therethrough
United States Patent 3177970
US Patent References:
Sound-absorbing board for walls and ceilings
- - 1554180

Sound absorbing construction
- - 1825770

Acoustic tile
- - 2014749

Duct
- - 2089492

Acoustic material
- - 2165101


Inventors:
Antonio, Boschi
Publication Date:
04/13/1965
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Assignee:
Gomma, Antivibranti Applic
Primary Class:
181/290
Other Classes:
428/137
International Classes:
E04B9/00; F16L55/02
US Patent References:
2362859Acoustical building element
2755882Acoustic tiles
2996138Perforated panel construction
3074339Sound-proofing, ventilating and conditioning