Patents by Inventor John J. Bosnak

John J. Bosnak 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).

  • Switching amplifier and electronic siren employing the same
    Patent number: 4668938
    Abstract: A signal having a rectangular waveform, typically in the audio frequency range, is capacitively coupled to a pair of Darlington circuits which are connected in a push-pull arrangement across the primary winding of a power transformer. A clamping circuit insures that the breakdown voltage of the base-emitter junction of the input transistors of the Darlington circuits will not be exceeded during coupling capacitor discharge.
    Type: Grant
    Filed: September 15, 1982
    Date of Patent: May 26, 1987
    Assignee: Whelen Engineering Company, Inc.
    Inventor: John J. Bosnak
  • Method of and apparatus for the testing of warning systems
    Patent number: 4554533
    Abstract: The operational status of a remotely controlled electronic siren is periodically tested, from a command post, without producing audible sound. The test procedure includes energizing the voice coils of the siren loudspeakers with a signal outside of the audible range, sensing whether current flows in the speaker voice coil circuits and storing the results of the test. The stored information, upon request, will be transmitted back to the command post.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: November 19, 1985
    Assignee: Whelen Engineering Company, Inc.
    Inventor: John J. Bosnak
  • Electronic siren
    Patent number: 4363028
    Abstract: An electronic siren-public address system with remote control capability. The siren-public address system employs a push-pull power amplifier wherein the output transistors are driven into saturation in the siren mode to minimize power dissipation in the power amplifier.
    Type: Grant
    Filed: July 10, 1980
    Date of Patent: December 7, 1982
    Assignee: Whelen Engineering Company, Inc.
    Inventor: John J. Bosnak
  • Strobe power supply
    Patent number: 4321507
    Abstract: A power supply, including a static inverter, which is suited for the periodic energization of a flash tube. The static inverter may be turned off during periods when a capacitive load charged thereby is being discharged through the flash tube. The power supply has the capability of causing two successive ionizations of a flash tube within a short time period and may include both over-current and over-voltage protection in the form of sensing circuits which disable the static inverter.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: March 23, 1982
    Assignee: Austin Electronics, Inc.
    Inventor: John J. Bosnak