Patents by Inventor Stephen E. Spychalski

Stephen E. Spychalski 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).

  • Hydrophone pre-amplifier with self-calibration
    Patent number: 4689578
    Abstract: A differential charge amplifier design for a hydrophone pre-amplifier inces a calibration circuit for in situ measurement of the hydrophone/pre-amplifier gain. The hydrophone signal is input to a pair of amplifier stages which form a balanced differential input charge amplifier. The signal from the input charge amplifier is amplified by a second pre-amplifier stage and then passed to a balanced output cable driver. The calibration circuit is enabled by an external signal to inject a calibration signal into the input charge amplifier front end.
    Type: Grant
    Filed: March 28, 1986
    Date of Patent: August 25, 1987
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Stephen E. Spychalski
  • Broadband matching network
    Patent number: 4644505
    Abstract: A broadband matching network for a Helmholtz resonator transducer is a series RL matching network capable of withstanding a high power level. The usable acoustic broadwidth is expanded to produce a symmetrical output over a broad frequency band.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: February 17, 1987
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Stephen E. Spychalski