Patents by Inventor Efstathios Demetres Grammenopoulos

Efstathios Demetres Grammenopoulos 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).

  • Electronic burglar alarm for vehicles
    Patent number: 4099158
    Abstract: An electronic burgler alarm for vehicles essentially comprising a pair of controlled diodes and related control circuitry for activating an alarm. In the preferred embodiment, the device is made from solid state components assembled in a unitary package and having four terminals that readily adapt the device for connection, respectively, to the positive side of a battery, to the load or alarm to be activated, to the chassis of the vehicle through a manually set switch, and to the door switch of the vehicle which operates an interior light.
    Type: Grant
    Filed: May 12, 1977
    Date of Patent: July 4, 1978
    Inventor: Efstathios Demetres Grammenopoulos