Patents by Inventor John W. Mullins

John W. Mullins 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).

  • Refrigerant line service valve
    Patent number: 4324270
    Abstract: A centrally bored and counterbored valve body is secured at one end to a refrigerant line. The line connected end of the valve body contains a normally closed valve core having a stem spring biased to close the valve core. The other end of the valve body contains a mandrel moveable toward and away from the valve core stem for opening and closing the latter. The mandrel contained end of the valve body is surrounded by a cap, containing a sealing ring, manually moved threadedly on the valve body for biasing the mandrel against the valve core stem to open position and sealing with the adjacent end of the valve body. At least one refrigerant outlet service valve is connected with the valve body through a valve body lateral port communicating with the valve body counterbore surrounding the mandrel.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: April 13, 1982
    Inventor: John W. Mullins
  • Refrigerant line connecting tee with step diameter bushing
    Patent number: 3997140
    Abstract: An elongated body is provided with a transverse bore for receiving a sleeve having end portions adapted for connection with selected size lines and forming a passageway. An axial threaded bore, in one end of the body, communicates with the transverse bore. The sleeve is provided with a wall aperture communicating with the threaded bore and sealing with the tip end of a valve housing threadedly engaged with the axial bore providing communication between the sleeve passageway and bore of the housing.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: December 14, 1976
    Inventor: John W. Mullins
  • Refrigerant system charging and evacuating manifold
    Patent number: 3996765
    Abstract: A device for servicing closed refrigerating systems comprising a body having a passageway therethrough provided at its respective ends with threaded members for connecting the device to an access valve of the refrigerant system and a refrigerant charging hose. The body rotatably supports a shaft having a camming surface at one end longitudinally moving a plunger toward a depressible valve core by manual rotation of the shaft for communication with the refrigerant system.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: December 14, 1976
    Inventor: John W. Mullins
  • Two-way tee for joining refrigerant lines
    Patent number: 3963212
    Abstract: An elongated body is provided with a transverse bore for receiving a short tube having flared ends adapted to be joined to adjacent ends of a refrigerant line. An axial threaded socket, in the adjacent end of the body communicating with the transverse bore, receives a valve core equipped valve housing for providing communication with the bore of the refrigerant line.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: June 15, 1976
    Inventor: John W. Mullins