4,584,232

43.50.Gf FOAM MATERIAL SOUND ABSORPTION

Werner Frank and Josef F. Irregeher, assignors to Illbruck GmbH Schaumstoff technik

22 April 1986 (Class 428/247); filed 20 January 1984

This patent relates to a sound absorbing fiber grid insert, set between two open-cell foam panels, to be used in an engine hood.--CJR

4,579,764

43.50.Gf MOLDED CARPET ASSEMBLY WITH SOUND DEADENING FOAM BACKING

Clarence A. Peoples, Jr., Jacquelyn S. Hicks, and Vernon C. Smith, assignors to Collins & Aikman Corporation

1 April 1986 (Class 428/95); •ed 15 July 1985

The patent describes a molded foam-back carpet assembly for auto- mobiles with enhanced vibration damping properties. There is a carpet lay- er, a molded thermoplastic polymer layer, and a sound deadening foam cushion. Control of the foam backing improves the performance of the composite.inC JR

4,583,615

43.50.Gf METHOD AND APPARATUS FOR CONTROLLING NOISE

Maurice Amram, Montreal, Quebec 22 April 1986 (Class 181/210); originally filed 22 February 1982

This device is placed typically on a barrier, between a noise source and an area to be protected. There are passageways and chambers through the device which are sized to create a 180 ø phase lag in sound passing through, and are intended to cause destructive interference with the sound passing over the barrier.--CJR

4,574,099

43.55.Ev ACOUSTIC PANELS

Michael T. Nixon, Plymouth, MN 4 March 1986 (Class 428/68); filed 20 January 1984

The panels described by this patent comprise glass •ber, a middle layer

15 10

17 18 16

for durability, edge supports, and an outer layer of plastic which seals the entire package so it is appropriate for sterile environments.--CJR

4,585,685

43.55.Ev ACOUSTICALLY POROUS BUILDING MATERIALS

John S. Forry and Karl B. Himmelberger, assignors to Armstrong World Industries, Incorporated

29 April 1986 (Class 428/143); filed 14 January 1985

The patent describes acoustically porous building materials which are

4,574,915

43.50. Lj SOUND BARRIERS

produced by embedding an aggregate material (like perlite) onto the sur- face of a dry-formed web fibrous material (like mineral wall) and a bind- er.•CJR

Heinemann Gahlaii, Manfred Hoffmann, and Klaus Wittenmayer, assignors to Dr. Alois Stankiewicz GmbH

11 March 1986 (Class 181/290); filed in Federal Republic of Germany 21 December 1983

This patent recites what seems to be a relatively common barrier wall

2 7 6

cladding of soft inter-layer and a heavy outer-layer forming a mass/spring damping system with certain specified surface densities.•CHA

4,594,278

43.55.Ev ACOUSTICAL PANELS

Michael T. Nixon, Plymouth, MN 10 June 1986 (Class 428/68); filed 20 January 1984

The panel described herein, like related patent 4,574,099 (reviewed below) is designed for use in sterile environments, but has a layer of mineral board within the plastic containment.•JR

4,584,701

43.55. Lb REVERBERATOR HAVING TAPPED AND RECIRCULATING DELAY LINES

Yasutoshi Nakama and Koji Watanabe, assignors to Matsushita Electric Industrial Company

22 April 1986 (Class 381/63); filed in Japan 27 December 1982

In this electronic reverberation circuit audio signal from source 1 is transmitted directly to the output on line B and through a parallel reverber- ation path A consisting of a delta modulator 2 feeding a tapped delay line

1866 J. Acaust. Sac. Am. 80(6), Dec. 1986; 0001-4966/86/121866-02500.80; ̧ 1986 Acaust. Sac. Am.; Patent Reviews 1866

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