Patents by Inventor Nicholas J. Arend

Nicholas J. Arend 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).

  • Wireline cable head for use in coiled tubing operations
    Patent number: 5392851
    Abstract: The invention is a wireline cable head adapted to be used on a wireline tool string which is conveyed into a wellbore by a coiled tubing. The cable head comprises a biased, piston-type check valve which enables fluid circulation from the tubing into the wellbore, but prevents fluid flow from the wellbore into the coiled tubing. The biasing means maintains a minimum differential pressure which must be pumped into the coiled tubing to enable fluid circulation from the coiled tubing into the wellbore. The cable head also comprises a bulkhead for maintaining hydraulic integrity of the cable head after the cable is extracted from the cable head.
    Type: Grant
    Filed: June 14, 1994
    Date of Patent: February 28, 1995
    Assignee: Western Atlas International, Inc.
    Inventor: Nicholas J. Arend