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Primary Examiner: Hunt, Brooks H.
Assistant Examiner:
Attorney: Schiller and Pandiscio

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Title: Acoustic filter

Abstract: An acoustical insulating material comprises a fiber reinforced lead composite sheet or panel. In a preferred embodiment of the invention the fibers are substantially axially parallel aligned with one another. The frequency absorption and transmission characteristics of the material may be varied by mechanically stressing the material, e.g. as by placing the material under tension in the direction of fiber orientation.

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Inventors: Marangoni, Roy D. (Pittsburgh, PA, US)
Gigerenzer, Horst (Hollis Center, ME, US)
Pepper, Roger T. (Cape Elizabeth, ME, US)

Application Number: 701562
Filing Date: 1976-07-01
Publication_date: 1980-08-05
Assignee: Fiber Materials, Inc. (Biddeford, ME)
Primary Class(es): 181/286 181/284
Other Classes:
US Patent Ref:

3087569	Apr, 1963	Kurtze	181/33.
3239973	Mar, 1966	Hannes et al.	181/33.
3738447	Jun, 1973	Rose	181/33.
3860443	Jan, 1975	Lachman et al.	427/113.
3894863	Jul, 1975	Lachman et al.	75/0.
3918141	Nov, 1975	Pepper et al.	29/419.

Other Refs: Other References: Richardson, Technical Aspects of Sound 1953 pp. 80-84.