Patents by Inventor Roger L. Johnson

Roger L. Johnson 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).

  • Patent number: 4989412
    Abstract: A method of manufacturing an automotive vehicle having an engine and a modular air conditioning system wherein all of the receiver-drier, evaporator, and interconnecting refrigerant tubes, are mounted on the engine as discrete components to form a complete refrigeration loop, tested, and repaired, if necessary, prior to the installation of the engine and refrigerant loop together in the vehicle. The vehicle radiator is also mounted to the engine to facilitate the condenser mounting.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: February 5, 1991
    Assignee: Navistar International Transportation Corp.
    Inventor: Roger L. Johnson
  • Patent number: 4909046
    Abstract: A modular automotive air conditioning system has all of the refrigerant loop components, i.e., compressor, condenser, receiver-drier, and evaporator, mounted on the engine as discrete components to form a unit which can be tested, and repaired if necessary, prior to installation of the engine and refrigerant loop together in the vehicle. The vehicle radiator is also mounted on the engine to facilitate the condenser mounting. In the vehicle, the evaporator is connected to the dash-mounted vehicle heater and blower with a flexible duct to accommodate relative motion between the engine-mounted evaporator and the heater.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: March 20, 1990
    Assignee: Navistar International Transportation Corp.
    Inventor: Roger L. Johnson
  • Patent number: 4705214
    Abstract: An independent heat system for heating a motor vehicle passenger compartment comprises a surge tank feeding the heat transfer medium to a pump which circulates fluid through the cab heater core, heat exchanger and a waste heater core, if necessary. The heat exchanger is connected to an engine exhaust system for heating the circulating medium by the engine exhaust gasses. The heat system can be adapted for heating of a vehicle passenger compartment in any vehicle having no engine water cooling system.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: November 10, 1987
    Assignee: Navistar International Transportation Corp.
    Inventor: Roger L. Johnson
  • Patent number: 4658846
    Abstract: A gas valve for attachment to a gas line for preventing flow of gas during and subsequent to a vibratory shock above a pre-determined intensity; a tilting of said valve beyond a pre-determined angle from the vertical; and/or when an excess flow of gas through said valve above a pre-determined velocity occures. The trip mechanism is a set of three hinged, centrally suspended inertia weights which are mass biased away from said suspension points and incorporate aerodynamically designed flow vanes and having release hooks at their lower inner facing ends which engage an articulated head atop a shaft and stopper assembly which is spring biased downward against a valve seat near the inlet orifice of said valve. The valve having an external reset lever and multiple inertia weight/flow vane configurations for custom applications.
    Type: Grant
    Filed: September 4, 1986
    Date of Patent: April 21, 1987
    Inventor: Roger L. Johnson
  • Patent number: 3946381
    Abstract: Method and apparatus for electrically interrogating gaseous discharge cells in a plasma panel to sense the state of said cells by selectively coupling a sensing impedance element for detecting the presence of a discharge current associated with cells having information. Graphic systems using electrical interrogation of gaseous discharge cells in a plasma panel to provide image editing and/or image transfer.
    Type: Grant
    Filed: May 14, 1973
    Date of Patent: March 23, 1976
    Assignee: National Science Foundation
    Inventors: Roger L. Johnson, Larry F. Weber