Patents by Inventor Don J. Sandefur

Don J. Sandefur 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).

  • Patent number: 4376332
    Abstract: A replacement stud for an original stud damaged in existing equipment consists of an oversized section having a threaded diameter larger than the original stud and a nominal section having a threaded diameter identical to that of the original stud. The nominal section is topped by a frangible, necked-down diameter capped by a suitable drive head for use with conventional hand or power drive tools. When the original stud has been damaged so as to preclude removal of a segment of it from the original stud hole, the stud hole is counterdrilled, enlarging its diameter and eliminating the broken segment. The larger threaded diameter of the snap-stud invention is set by the original stud's threaded diameter and the drill size predetermined for counterdrilling the original stud hole.
    Type: Grant
    Filed: April 24, 1981
    Date of Patent: March 15, 1983
    Inventor: Don J. Sandefur