4,699,006

43.40.Yq VIBRATORY DIGITAL INTEGRATING ACCELEROMETER

Burton Boxenhorn, assignor to The Charles Stark Draper Laboratory, Incorporated

13 October 1987 {Class 73/517); filed 4 February 1986

This microminiature inertial guidance sensor, intended to be mass- produced by semiconductor manufacturing techniques, consists of a resil- iently supported weight having a moment of inertia that changes ds the weight is displaced due to acceleration along its input axis. This change in moment of inertia results in a change in the system's natural frequency, thus providing a measure of the acceleration.mEEU

4,711,128

43.40.Yq MICROMACHINED ACCELEROMETER WITH ELECTROSTATIC RETURN

Andr6 Boura, assignor to Sacleto Francaise d'Equipements pur la Aerienne

8 December 1987 (Class 73/517 B); filed in France 16 April 1985

This accelerometer is made by micromachining a fine monocrystal wafer (e.g., of quartz), and vacuum-depositing a, ppropriate conducting sur- faces, so as to obtain a resiliently supported plate disposed between two fixed capacitor plates. Voltages are applied to all three plates. Voltage devia- tions obtained on the outer plates as the result of relative displacement of the middle plate are used to obtain a measure of acceleration.mEEU

4,712,427

43.40.Yq VIBRATING BEAM ACCELEROMETER WITH VELOCITY CHANGE OUTPUT

Rex B. Peters, assignor to Sundstrand Data Control, Incorporated 15 December 1987 (Class 73/517}; filed 17 September 1986

This inertial guidance system accelerometer consists of two vibrating- beam sensors that produce different output frequencies in response to accel- eration along their common sensitive axis, with the frequency output of one decreasing and that of the other increasing with increasing acceleration. The velocity change is obtained from observation of the relative phase change over a given time interval.mEEU

4,705,139

43.50.Gf SOUND INSULATION PART FOR SURFACES

Heinemann Gahlau, Manfred Hoffmann, and Norbert Seemann, as- signors to Dr. Alois Stankiewicz GmbH

10 November 1987 {Class 181/290}; filed in the Federal Republic of Germany 6 September 1985

The patent describes a sound insulation part for passenger cars that is claimed to achieve effective results with low mass and light weight. It does so by imbedding closed cells (containing air or gas) in the foam material of the spring. These discontinuities enhance performance. The closed cells have to be encased in foil.mCJR

4,702,046

43.55.Dt ACOUSTICAL WALL PANEL

Per Haugen, Harold M. Haugen, and Ingolf J. C. DeJong, assignors to General Communications, Incorporated

27 October 1987 {Class 52/144}; filed 8 November 1985

An acoustical panel is described for mounting on walls, which includes a wooden support frame, low-density glass fiber batts, and a generally rigid acoustical board in front of the frame. The components are selected to broaden the frequency spectrum of the absorption from the panel. The sys- tem includes a mounting frame and attachment of a sound transparent facing.inC JR

4,696,141

43.55.Dt SUSPENDED CEILING HAVING A

CONCEALED SUSPENSION GRID AND LAY-IN METAL PANELS SUPPORTED THEREON

Martin Nassof, assignor to Simplex Ceiling Corporation 29 September 1987 {Class 52/484}; filed 19 June 1986

The patent discloses a "lay-in" suspended ceiling system in which the inverted T-shaped members are concealed and the joints between abutting

metal panels are aligned.mCJR

4,701,066

43.55.Dt DECORATIVE SOUND ABSORBING PANEL

FOR FURNITURE

John W. Beam and Edmund T. Paquette, assignors to Wright Line, Incorporated

20 October 1987 {Class 403/298); filed 20 May 1986

This patent describes a method for securing decorative sound absorb- ing panels around furniture, such as cabinets in an office; the system uses a concealed interlocking fastener and mitered splines.•CJR

4,715,473

43.55.Dt FOAM ACOUSTIC ABSORPTION MEMBER

Rolf Tschudin-Mahrer, assignor to Irbit Research & Consulting AG, Switzerland

29 December 1987 (Class 181/286}; filed in the Federal Republic of Germany 14 December 1984

This is another lining (or flow-optimized absorber) for possible use under the hood of an automobile; the acoustic absorber is'a layer of foam, pressed against a stabilizing layer (of plastic) that has perforations.•CJR

4,720,946

43.55.Dt METHOD AND STRUCTURE FOR

INSTALLING DROP CEILING TILES CLOSE TO CEILING

Saveria J. Pagliarello, Brooklyn, NY 26 January 1988 {Class 52/39}; filed 8 May 1986

This patent describes a system for in•talling a suspended acoustic tile ceiling close to the structural surface. It uses grid lack elements that are attached to the ceiling and into which the main T members of a suspended ceiling are inserted. Regular acoustic tile can then be attached from be- 1ow.•CJR

4,710,309

43.55.Ev LIGHTWEIGHT SOUNDPROOFING, INSULATION AND FIREPROOFING MATERIAL AND

METHOD

Dennis C. Miller, assignor to American Sprayed-On Fibers, Incorpo- rated '

1 December 1987 {Class 252/62); filed 4 December 1986

Here is a sprayed-on material suitable for soundproofing, insulation, and fireproofing. It combines an inorganic lightweight nonflammable fi- brous material (like mineral wool), plus an organic lightweight normally

463 J. Acoust. Sac. Am. 84(1), July 1988; 0001-4966/88/070463-02500.80; ¸ 1988 Acoust. Sac. Am.; Patent Reviews 463

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