Patents by Inventor Victor Thomas

Victor Thomas 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).

  • R 22 replacement refrigerant
    Patent number: 6606868
    Abstract: A refrigerant composition comprising a hydrofluorocarbon component including 1,1,1,2-tetrafluoroethane (HCFC 134a), the composition further comprising an additive selected from a saturated hydrocarbon or mixture thereof boiling in the range −5 to +70° C.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: August 19, 2003
    Assignee: Refrigerant Products, Ltd.
    Inventors: Richard L. Powell, John Edward Poole, John Derek Capper, James Victor Thomas
  • R 12 replacement refrigerant
    Patent number: 6604368
    Abstract: A refrigerant composition comprising 1,1,1,2-tetafluoroethane (R134a) butane and pentane wherein the weights of butane, pentane and R134a are in the range: Pentane and butane  1-5% R134a 99-95%
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: August 12, 2003
    Assignee: Refrigerant Products, Ltd.
    Inventors: Richard L. Powell, John Edward Poole, John Derek Capper, James Victor Thomas
  • Injection molding device with back pressure control of screw movement
    Patent number: 3930600
    Abstract: A method of and apparatus for injection molding of materials such, for example, as thermoplastic resinous material, utilizing a rotatable and reciprocal screw extruder for plasticizing and injecting the material into a mold cavity, and wherein an injection piston in a cylinder is operatively connected to the plasticizing screw to push the screw forward to effect injection into a mold of plasticized material in front of the screw. A supply of fluid pressure is positively applied to the injection piston to provide a back pressure to act against the reaction caused by the rotation of the plasticizing screw, and this back pressure may be regulated to correspond with the rearward displacement, of the screw.
    Type: Grant
    Filed: May 22, 1973
    Date of Patent: January 6, 1976
    Inventor: Victor Thomas Gardner