Patents by Inventor John C. Frederick

John C. Frederick 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).

  • Apparatus for maintaining level of liquid-gas interface in a vulcanizing tube
    Patent number: 4533306
    Abstract: A measuring tube containing a permanent magnet on a float is connected to a tube, containing steam and water for vulcanizing and cooling the insulation on an electric cable, so that the water-steam interface in the measuring tube corresponds to the water-steam interface in the vulcanizing tube. The magnet position corresponds to the water-steam interface and operates switches external to the measuring tube and connected to a voltage divider so that the output voltage of the divider corresponds to the water-steam interface. The voltage output of the divider is compared with pre-set voltages and differences between the voltages are used to control pumps, valves, etc., so as to maintain the water-steam interface at the desired level and the voltage output of the divider is used to operate lamps, and/or alarms, and valves when the interface is excessively high or low.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: August 6, 1985
    Assignee: Pirelli Cable Corporation
    Inventor: John C. Frederick
  • Compact disc rack
    Patent number: D450518
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: November 20, 2001
    Inventor: John C. Frederick
  • Honeycomb shelving system
    Patent number: D484333
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: December 30, 2003
    Inventor: John C. Frederick
  • Vessel
    Patent number: D884550
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: May 19, 2020
    Inventor: John C. Frederick