Patents by Inventor Rex L. Hewitt

Rex L. Hewitt 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).

  • Grouting application of the annulas seal system for well casings
    Patent number: 5964292
    Abstract: A grouting system for well casings (26) uses a grout wrap (10) including first (12) and second (14) flexible sheets with a layer (16) of flexible, hydrophilic grout material therebetween that expands upon absorption of water. In the preferred embodiment, each well casing section (30a,b) is enclosed by the preferred grout wrap (10) before placement in the well hole (28). After placement, the grout material is exposed to water for absorption so that the grout material expands and seals the casing.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: October 12, 1999
    Inventor: Rex L. Hewitt