REVIEW OF ACOUSTICAL PATENTS

Daniel W. Martin

Baldwin Piano & Organ Company, Cincinnati, Ohio 45202

Any opinions here expressed are those of reviewers as individuals and are not legal opinions. Printed copies of United States Patents here reviewed may be ordered at 50 cents each from the Commissioner of Patents and Trademarks, Washington, D.C. 20231

Reviewers: CLAYTON H. ALLEN, 651 Concord Avenue, Cambridge, Massachuset• 02138 GEORGE L. AUGSPURGER, Perception Incorporated, Box 39536, Los Angeles, California 90039 LAURENCE BATCHELDER, 983 Memorial Drive, Cambridge, Massachusetts 02138 JOHN V. BOUYOUCOS, Hydroacoustics, Incorporated, P.O. Box 3818, Rochester, New York 14610 M.D. BURKHARD, Industrial Research Products, incorporated, Elk Grove Village, Illinois 60007 MARVIN CAMRAS,/iT Research Institute, 10 West 35th Street, Chicago, illinois 60616 R. W. CARLISLE, P. E., 10 Executive 81yd., Elmsford, New York 10523 PATRICK M. FLANAGAN, University of Cincinnati, Cincinnati, Ohio 45221 D AV I D S. G O L DSM IT H, 8359 South Crandon A venue, Chicago, Illinois 60617 J. B. GRAHAM, 3777 Windover, Hamburg, New York 14075 SAMUEL F. LYBARGER, 101 Oakwood Road, McMurray, Pennsylvania 15317 T. R. MEEKER, Bell Laboratories, 555 Union Boulevard, Allentown, Pennsylvania 18103 T. D. NORTHWOOD, National Research Council, Ottawa, Ontario, Canada, K 1A OR6 ROBERT W. PY LE, Jr., Bolt Beranek and Newman, 50 Moulton Street, Cambridge, Massachusetts 02138 D. LLOYD R ICE, Computalker Consultants, Box 1951, Santa Monica, California 90406 JERRY L. SUTTON, Naval Ocean Systems Center, San Diego, California 92152 ERIC E. UNGAR, Bolt Beranek and Newman Incorporated, 50 Moulton Street, Cambridge, Massachusetts 02138 GLENN E. WARNAKA, Allforce Acoustics, Lord Corporation, Erie, Pennsylvania 16512 THOMAS G. WINTER, University of Tulsa, Tulsa, Oklahoma 74104 ROBERT W. YOUNG, 1696 Los Altos Road, San Diego, California 92109

4,218,921

43.25.Cb METHOD AND APPARATUS FOR SHAPING AND ENHANCING ACOUSTICAL LEVITATION FORCES

•qlliam A. O•an, LeRoy H. Berge, Donald A. Reiss, and Jerry L. Johnson, assignors to the United States of America

26 August 1980 (Class 73/505);f'lled 13 July 1979

Acoustical levitation forces in a single-axis acoustic resonance system are said to be enhanced and shaped by the use of specially contoured driving and reflecting surfaces. Improved levitation of fluid substances is claimed.-JYB

4,210,971

43.30.-k LONG DISTANCE UNDERWATER

COMMUNICATION

•liam H. Martin, Jr., assignor to the United States of America

I July 1980 (class 367/134);filed 11 September 1963

A method of communication by sweep-frequency modulated underwater sound was described by Warren A. Tyrrell in Patent 3,811,106 [reviewed J. Acoust. Soc. Am. 56, 1662 (1974)]. It uses a power of 1 kW or more at frequencies below 500 Hz. According to this invention, audio.frequency power may be gener- ated by an engine-driven alternator. The speed is measured by a tachometer, and the engine's throttle is controlled automatically by comparing the tachometer output with a suitably programmed reference voltage. Fluctuations in speed are held to less than 1 part in 80 000.-LB

4,210,969

43.30.Vh SONIC RANGING SYSTEMS TO ELIMINATE ERRORS DUE TO VARIATIONS IN THE SOUND

VELOCITY IN THE MEDIUM

Frank Massa, assignor to The Stoneleigh Trust I July 1980 (Class 367/108); filed 13 March 1978

To determine the height of liquid or solid material in a storage tank, an echo sounder measures the height D2 of the empty space above the surface 8. The measurement depends on the speed of sound, which may vary considerably with temperature and pressure, and with the concentration of whatever vapor is present in the

4\

space. Therefore, a small target 6 is fixed at a known distance DI below the transducer I to provide a reference echo. Thus, there are two echoes, one from the surface 8 and one from the target 6. Digital circuitry computes D2 from the ratio of the echo times, and subtracts D2 from HT to display HL.-LB

1234 J. Acoust. Soc. Am. 69(4), April 1981 0001•t966/81/041234-01500.80 ¸ 1981 Acoustical Society of America 1234

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