Patents by Inventor Robert A. Ritt

Robert A. Ritt 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).

  • Thermal switch and heater
    Patent number: 6707370
    Abstract: A thermal switch comprises an elongate tubular sealed housing. A control circuit is mounted in the housing. The control circuit comprises a thermostat, a fuse and a thermal overload switch electrically connected in series. An electrical connector is mounted to the housing and is connected to the control circuit.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: March 16, 2004
    Assignee: Acra Electric Corporation
    Inventors: Robert A. Ritt, Ruben Rivera
  • Thermal switch and heater
    Publication number: 20030201865
    Abstract: A thermal switch comprises an elongate tubular sealed housing. A control circuit is mounted in the housing. The control circuit comprises a thermostat, a fuse and a thermal overload switch electrically connected in series. An electrical connector is mounted to the housing and is connected to the control circuit.
    Type: Application
    Filed: April 26, 2002
    Publication date: October 30, 2003
    Inventors: Robert A. Ritt, Ruben Rivera
  • Cartridge heater
    Patent number: 4763102
    Abstract: An electrical cartridge heater includes a flat rectangular core of mica. A resistance wire is helically wound around the mica core. A cover sheet of mica is placed on one face of the wound core so that a return wire extends back without shorting against the other wires. The mica core is received in recesses in head and slug end bushings to position the element centrally within a cylindrical shell. A granular fill surrounds the core and heating element within the shell.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: August 9, 1988
    Assignee: Acra Electric Corporation
    Inventor: Robert A. Ritt