Patents by Inventor David M. Gilson

David M. Gilson 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).

  • Riser sleeves for custom sizing and firm gripping
    Patent number: 5915450
    Abstract: This invention relates to riser sleeves which contain markings and concentric grooves. The markings are used to as a guide so one can customize the size of the sleeves and the concentric grooves are used to help hold the sleeve in place when it is placed in the mold where it surrounds the riser. The invention also relates to the use of the riser sleeves in the making of metal castings.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: June 29, 1999
    Assignee: Ashland Inc.
    Inventors: Ronald C. Aufderheide, David M. Gilson, John L. Perrins
  • Riser sleeve
    Patent number: D397702
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: September 1, 1998
    Inventors: Ronald C. Aufderheide, David M. Gilson, John L. Perrins