Patents by Inventor Alfred Paul Sprenger

Alfred Paul Sprenger 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).

  • Oil well pump
    Patent number: 4082483
    Abstract: A novel oil well pump for reaching greater depths in wells than prior art structures having reduced down casing sizes wherein the pump comprises a plurality of individual hollow cylindrical chambers each operable in a given part of the pipe casing in conjunction with a pump plunger.
    Type: Grant
    Filed: August 24, 1976
    Date of Patent: April 4, 1978
    Inventor: Alfred Paul Sprenger