Patents by Inventor Mark Isaakovich Frenkel

Mark Isaakovich Frenkel 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).

  • Cylinder of piston compressor
    Patent number: 4068562
    Abstract: A cylinder of a piston compressor comprises a piston movable along the axis of the cylinder, a cylindrical admission valve and a cylindrical delivery valve. The admission valve communicates an admission space of the cylinder with a working space thereof. The delivery valve communicates the working space of the cylinder with a delivery space thereof.At least one valve, for instance the admission valve has means providing the control of the capacity of the cylinder, the movable member of said means being coaxially arranged inside the cylindrical admission valve.
    Type: Grant
    Filed: December 19, 1973
    Date of Patent: January 17, 1978
    Inventor: Mark Isaakovich Frenkel