Patents by Inventor David J. Evans

David J. Evans has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Selective prevention of bipolar violation detection
    Patent number: 4750179
    Abstract: Bipolar violation error counters are rendered insensitive to bipolar violations arising from the presence of bipolar eight-zero suppression (B8ZS) patterns in a bipolar pulse train by detecting B8ZS patterns in the pulse train applied to the error counter, and zeroing those bits of the B8ZS pattern which produce bipolar violations.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: June 7, 1988
    Assignee: Lynch Communications Systems, Inc.
    Inventors: Clifford A. Davidow, David J. Evans
  • Artificial underwater target
    Patent number: 4200920
    Abstract: 1. In combination in a free, underwater craft, a hull, means for carrying llast, means for discharging said ballast, depth responsive means, a timer providing two time intervals, control means operated by said timer for actuating said discharging means after a pre-set time interval, and other control means operated by both said timer and said depth reponsive means for actuating said discharge means after a shorter time interval if said craft attains a pre-set depth.
    Type: Grant
    Filed: February 29, 1956
    Date of Patent: April 29, 1980
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: David J. Evans, Clark F. Bradley
  • Device for simulating marine craft noises
    Patent number: 4200859
    Abstract: 1. In combination in electronic apparatus for simulating the self-noise of submarine, means for generating a wide-band noise signal, means for modulating the noise signal at a frequency corresponding to the propeller speed of a submarine, means for generating a signal at the frequency of the tooth impacts of the main drive gear of a submarine, and amplifying and output means for both said tones.
    Type: Grant
    Filed: April 21, 1946
    Date of Patent: April 29, 1980
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: David J. Evans, Clark F. Bradley
  • Hand pump
    Patent number: D287531
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: December 30, 1986
    Assignee: D. J. Evans Design Limited
    Inventor: David J. Evans