Patents by Inventor Charles W. Bleifeld

Charles W. Bleifeld 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).

  • Top entry sub arrangement
    Patent number: 5284210
    Abstract: A top entry sub (ES) includes a tubular member (TM) with a main body section (8) and an enlarged external diameter upper end portion (11). A single passage (15) extends through the main body section (8) and terminates in a pair of spaced passages (14) and (14a) that extend through the enlarged external diameter end portion (11), which passages terminate in a common upper surface on the top entry sub (ES) for receiving a well string and providing an entry into the top entry sub for members such as coiled tubing, snubbing members and cable.
    Type: Grant
    Filed: February 4, 1993
    Date of Patent: February 8, 1994
    Inventors: Charles M. Helms, Charles W. Bleifeld
  • Top entry sub arrangement
    Patent number: RE39509
    Abstract: A top entry sub (ES) includes a tubular member (TM) with a main body section (8) and an enlarged external diameter upper end portion (11). A single passage (15) extends through the main body section (8) and terminates in a pair of spaced passages (14) and (14a) that extend through the enlarged external diameter end portion (11), which passages terminate in a common upper surface on the top entry sub (ES) for receiving a well string and providing an entry into the top entry sub for members such as coiled tubing, snubbing members and cable.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: March 13, 2007
    Assignee: Specialty Rental Tools & Supply, LP
    Inventors: Charles M. Helms, Charles W. Bleifeld