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US 4,057,123 AGranted
Lightweight sound absorbent panels having high noise reduction coefficient
AssigneeConwed Corporation
InventorGordon A. Erickson
Life of this patent
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Abstract
A lightweight sound absorbing panel is disclosed. The panel comprises front and rear faces mounted to a supporting frame and having a core therebetween. The core is at least partially free airspace throughout a substantial portion of the area of the panel whereby weight reduction and increased sound absorption are obtained.
Claims8
A portable sound absorbing panel which has a fire rating of Class 1 according to ASTM Test No. C-423-66 comprising:
- a. a frame comprising a plurality of framing members capable of receiving staples, said frame defining an area and said frame having front and rear faces;
- b. a layer of sheet material affixed to said front and rear faces of said frame and defining a volume therebetween, said sheet material being a fire resistant laminate;
- c. at least one layer of sound absorbing material positioned on one of said faces atop said layer of sheet material said sound absorbing material being a glass fiber blanket having a density of from about 1/2 to about 3 pounds per cubic foot;
- d. a covering material on top of the said sound absorbing material said covering material being selected from the group consisting of woven fiberglass and polyesters which have been chemically treated for fire retardancy;
- e. said volume being at least about 1/4 inch in thickness throughout a substantial portion of said area of said frame.
2 more elements
Dependencies are inferred from the claim text.