Patents by Inventor John Forrest Anderson

John Forrest Anderson 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: 3952817
    Abstract: Basket type core retainer apparatus that includes a core receiving tube having an axially inner end, an annular drill bit or tubular extension connected to the inner end of the core receiving tube and a core retainer cooperatively mounted by the tube and the bit or tubular extension to permit passage of core into the tube and retain a core or a soil sample in the tube. The core retainer includes a mounting ring that mounts a pair of spring finger assemblies to extend axially outwardly thereof. The finger assemblies are each formed from a single sheet of material, the fingers of the assemblies in a closed (core retaining) position having each finger of one assembly in partial overlapping relationship to an adjacent finger of the other assembly and in partial underlapping relationship to an adjacent finger of said other assembly. The fingers are movable to permit passage of a core or a soil sample into the receiving tube.
    Type: Grant
    Filed: March 8, 1974
    Date of Patent: April 27, 1976
    Assignee: Longyear Company
    Inventor: John Forrest Anderson