Patents Assigned to Edgar N. Prince
  • Inside pipe wiper
    Patent number: 4034807
    Abstract: A tool for automatically scraping off mud and oil from the inside wall of pipe being lifted during an oil well drilling operation; the tool including an elongated float that fits loosely inside the pipe and which is of a weight so that it floats on the surface of the oil and mud; the upper end of the tool which is above the water and oil level having arcuate wiper blades extending all around that wipe off the inside wall; the tool being dropped down into the pipe when the pipe is intended to be raised.
    Type: Grant
    Filed: August 12, 1975
    Date of Patent: July 12, 1977
    Assignee: Edgar N. Prince
    Inventors: Edgar N. Prince, George Spector