Patents by Inventor John L. Craven

John L. Craven 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).

  • Electrical heater
    Patent number: 4156128
    Abstract: An electrical heater is combined with a thermostat in a sealed enclosure itself sealed in a glass tube, the enclosure comprising two tubes telescoped together, one being translucent and containing the thermostat and the other being of electrically insulating material, e.g. ceramic.
    Type: Grant
    Filed: March 17, 1978
    Date of Patent: May 22, 1979
    Assignee: Liquifry Company Limited
    Inventor: John L. Craven
  • Electrical heater for heating liquid
    Patent number: 4072847
    Abstract: An electrical heater comprises a sealed glass tube containing a sealed tubular structure formed by, (a) a metal tube containing an electrical heating element insulated from the metal tube, and (b) a plastics tube sealed to one end of the metal tube and containing a thermostat for the heating element.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: February 7, 1978
    Assignee: Liquifry Company Limited
    Inventor: John L. Craven