5,127,235

43.50.Ki LOW NOISE REFRIGERATOR AND NOISE CONTROL METHOD THEREOF

Keiji Nakanishi and Yasuyuki Sekiguchi, assignors to Kabushiki Kai- sha Toshiba

7 July 1992 (Class 62/115); filed in Japan 18 December 1989

A refrigerator has a machine chamber and a feedback (electrovibra- tional-acoustical) system with an A/D conversion means to determine co-

24

hereace and transfer functions for reducing noise inside the machine chamber using a loudspeaker. This reduces noise radiation to the outside. Data indicate about 5-dB reduction of numerous resonance peaks.--CHA

determining the sound response of a room and matching the acoustical properties of this tuned absorber to the reciprocal of the room response.-- CJR

5,135,073

43.55.Ev ACOUSTICAL PARTITION AND METHOD OF MAKING SAME

Thomas E. Nelson, assignor to Soltech, Incorporated 4 August 1992 (Class 181/290); filed 27 November 1990

This acoustical panel (e.g., office barrier) is comprised of a rectangu- lar, rigid, hollow frame, having its interior filled with an acoustical core (e.g., layers of insulation), covered with fabric.--CJR

5,083,639

43.55.Ti ACOUSTICAL SEAL FOR ELEVATOR CAR DOORS

Franz Kappeler, assigner to Inventio AG 28 January 1992 (Class 157/51); filed in Switzerland 22 September

1989

This apparatus, in its various configurations, seals an automatic eleva- tor door against sound leaks. A post seal utilizes an elastic strip; an abut- ment seal utilizes a sliding brush seal; a door sill seal utilizes a labyrinth seal.--CJR

5,137,111

43.55.Ev ACOUSTIC ABSORBER, AND METHOD OF MANUFACTURE THEREOF

Murray F. Diduck, Daneil A. Diduck, and Jeffrey M. Dehid, Alberta, Canada

11 August 1992 (Class 181/295); filed 26 July 1990

The acoustic absorber is a low-frequency passive absorber comprising a hollow cylinder with acoustically porous frame and a segmented core filled with absorbent filler. The method of manufacture referred to includes

5,123,874

43.55.Ti KNOCK-DOWN SOUND ATTENUATING SYSTEMS

Thomas B. White, III, Columbia, MD 23 June 1992 (Class 454/251); filed 9 October 1990

This sound isolation booth can be taken apart, transported, and re-

1674 J. Acoust. Soc. Am., Vol. 93, No. 3, March 1993 Review of Acoustical Patents 1674

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 128.82.252.58 On: Sun, 21 Dec 2014 13:13:29

26

erected at a new site because the panels interlock and seal with flexible strap coupling gaskets.--CJR

5,131,194

43.55.Ti SOUND BARRIER WINDOW

Robert B. Anderson, assignor to MacArthur Company 21 July 1992 (Class 52/144); filed 18 April 1991

This patent touts the benefit of double windows where two panes of

The bottoms of the panels are shaped to match the contour of the berm and are partly buried in a particulate sound-absorbing layer. The panels include a solid reflecting rear wall and a sound-absorbing front layer held in place by edge strips.--CJR

5,146,051

43.66.Ts HOUSING SHELL FOR AN IN-THE-EAR HEARING AID

Dietmar Hermann, assignor to Siemens Aktiengesellschaft 8 September 1992 (Class 181/130); filed in European Patent Office

26 July 1989

The patent describes a process for producing a vent in an in-the-ear hearing aid shell. A silicone tube having an outside diameter equal to the desired vent bore is strung with a series of beads made of a material similar to that of the shell to be made. A formable wire is placed inside the tubing. The tube assembly is placed in the desired position in the negative cavity as

!1

to

5

'17

shown in the figure. The cavity is filled with a polymizerable hardenable plastic material and the excess poured out after a short polymerization time that gives the desired shell thickness. After full hardening of the shell, the wire and silicone tube are pulled out, leaving the vent hole.--SFL

5,148,887

43.66.Vt EARCUP ASSEMBLY INCORPORATING

MECHANICAL ACTIVE NOISE REDUCTION

John A. Murphy, assignor to Gentex Corporation 22 September 1992 (Class 181/129); filed 1 April 1991

The device shown has an earcup shell with a resilient seal that presses against the wearer's head around the ear. A resilient pad cemented to the inside of the earcup is attached to the back of a piston. The piston is held in a fixed position relative to the wearer's head to maintain an approximately

glass or plastic are of different thickness and/or density. The panes are mounted in a flexible gasket.--CJR

5,136,821

43.55.Ti METHOD OF FORMING NOISE ATTENUATION BARRIER

Christopher L. Child, assignor to CECCO Trading, Incorporated 11 August 1992 (Class 52/144); filed 29 October 1990

This patent is for a highway (or exterior) noise barrier. The barrier has panel sections that are suspended on vertical posts installed in earth berms.

constant volume in the space between the piston and the ear seal. When the seal is "pumped" by noise acting on the earcup, its effect is stated to be reduced at low frequencies, where most earmuffs are least effective.•SFL

1675 J. Acoust. Soc. Am., Vol. 93, No. 3, March 1993 Review of Acoustical Patents 1675

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 128.82.252.58 On: Sun, 21 Dec 2014 13:13:29