Patents by Inventor John D. Chaffin

John D. Chaffin 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: 4100981
    Abstract: Apparatus for concentric multi-string drilling with reverse air vacuum for the entrainment of chips and dust, selectively controlled through a plurality of annuli defined by the multiplicity of drill strings adapted to individually and/or cooperatively operate drill bits and reamers and the like to bore geological formations as required.
    Type: Grant
    Filed: February 4, 1977
    Date of Patent: July 18, 1978
    Inventor: John D. Chaffin
  • Patent number: 3968845
    Abstract: Apparatus and method for complete reverse air vacuum drilling by entrainment of chips and dust in a high velocity air stream created by applying a vacuum to the drill stem or the annulus of a drilled hole, removing the drilled particles by entrainment in the flow of air created by the vacuum and collection of the drilled particles for visual or other analysis.
    Type: Grant
    Filed: March 6, 1975
    Date of Patent: July 13, 1976
    Inventor: John D. Chaffin