Title:
Sound-absorbing panels with tapered holes therethrough
United States Patent 3177970
Inventors:
Antonio, Boschi
Publication Date:
04/13/1965
Export Citation:
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Assignee:
Gomma, Antivibranti Applic
Primary Class:
181/290
Other Classes:
428/137
International Classes:
E04B9/00; F16L55/02; E04B9/00; F16L55/02
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US Patent References:
3074339Sound-proofing, ventilating and conditioning
2996138Perforated panel construction
2755882Acoustic tiles
2362859Acoustical building element
2165101Acoustic material
2089492Duct
2014749Acoustic tile
1825770Sound absorbing construction
1554180Sound-absorbing board for walls and ceilings