Patents by Inventor Ronald A. Lieffering

Ronald A. Lieffering 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).

  • Method for installing a hollow pipe
    Patent number: 4834583
    Abstract: The present invention relates to stabilizing a structure embedded in an earth formation by disposing the solidifiable liquid resin composition between at least an external portion of the structure and the surrounding earth formation, and solidifying the resin composition in intimate and static contact with both the structure and the formation, whereby the solidified resin is bonded to both the structure and the formation.The liquid thermosetting resin-forming composition contains 10-50%v polyglycidylether of 2,2-bis(4-hydroxyphenyl)propane, 10-88%v ethylacetate, 0-78%v butoxyloxitol, 2-20%v diethanoltriamine, 0-78%v xylene and 0-15%v dimethylaminomethylphenol.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: May 30, 1989
    Assignee: Shell Oil Company
    Inventors: David L. Roberts, Ronald A. Lieffering