Patents by Inventor Daniel F. Fehler

Daniel F. Fehler 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).

  • Use of mono and polyalkylene glycol ethers as agents for the release of differentially stuck drill pipe
    Patent number: 4614235
    Abstract: A formulation suitable for preparation of a spotting pill effective in the release of stuck pipe in a borehole during a drilling operation which formulation contains a mono and/or poly alkylene glycol ether and viscosified sufficiently to make the formulation compatible with a solids weighting material such as barite.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: September 30, 1986
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Ivian G. Keener, John C. Newlove, Robert C. Portnoy, Daniel F. Fehler, Kenneth W. Pober