Patents by Inventor Thomas Doner

Thomas Doner 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).

  • Circuit for controlling operation of a load after a predetermined time delay
    Patent number: 5705987
    Abstract: A circuit for controlling operation of a load, such as an alarm circuit in a fire protection system, in which operation of the load is delayed for an adjustable time period. The load control circuit includes a DIAC for generating a first trigger signal, an SCR which generates a second trigger signal, and a switch, preferably a TRIAC, which provides a supply voltage to the load upon receipt of the second trigger signal. A variable resistor is provided to adjust the time required to generate the first trigger signal.
    Type: Grant
    Filed: January 22, 1996
    Date of Patent: January 6, 1998
    Assignee: AGF Manufacturing, Inc.
    Inventor: Thomas Doner