Patents by Inventor Stephen D. Spafford

Stephen D. Spafford 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 refracturing zones in hydrocarbon-producing wells
    Patent number: 5273115
    Abstract: A method is provided for refracturing a well which has previously been hydraulically fractured in a lower zone or in the same zone. A sealing material is injected and allowed to solidify, the well is reperforated and refractured.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: December 28, 1993
    Assignee: Gas Research Institute
    Inventor: Stephen D. Spafford