Patents by Inventor Ernest V. Hart

Ernest V. Hart 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).

  • Ionization smoke detector and alarm system
    Patent number: 4037206
    Abstract: An ionization smoke detector particularly suited to residential use is battery-operated and is connected with a non-latching, pulsating alarm circuit. The detector has a sensing chamber formed by a perforated metallic shell and an electrode within which an insulated radiation source is centrally positioned to generate an ionization current for detecting smoke or other similar aerosols. The alarm circuit provides a pulsating alarm signal when smoke levels above a predetermined value are sensed. The alarm circuit also includes a low voltage detection circuit for sounding the alarm when the end of useful battery life is approaching.
    Type: Grant
    Filed: April 9, 1976
    Date of Patent: July 19, 1977
    Assignee: Emhart Industries, Inc.
    Inventors: John Dobrzanski, Edward Boyd Gardner, Ernest V. Hart
  • Ionization smoke detector and alarm system
    Patent number: 3934145
    Abstract: An ionization smoke detector particularly suited to residential use is disclosed. The detector is battery-operated and is connected with a non-latching, pulsating alarm circuit. The detector has a sensing chamber formed by a perforated metallic shell and an electrode within which an insulated radiation source is centrally positioned to generate an ionization current for detecting smoke or other similar aerosols. The alarm circuit provides a pulsating alarm signal when smoke levels above a predetermined value are sensed. The alarm circuit also includes a low voltage detection circuit for sounding the alarm when the end of useful battery life is approaching.
    Type: Grant
    Filed: October 25, 1973
    Date of Patent: January 20, 1976
    Assignee: Emhart Corporation
    Inventors: John Dobrzanski, Ernest V. Hart