Patents by Inventor David John Harper

David John Harper 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).

  • Retractable snowboard support apparatus for use in lift assist transport
    Patent number: 7484765
    Abstract: A snowboard support device for use in lift assist transport. The device may have a base, an extension shaft and a handle member or the like. In one embodiment, the handle serves as a housing to cover the extension shaft in its closed position and provides an engagement surface for non-fixed, gravity-based engagement of a chair lift seat.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: February 3, 2009
    Inventor: David John Harper
  • Method and apparatus of producing an organo-nitrogen compound
    Patent number: 5730845
    Abstract: A method of producing an organo-nitrogen compound by the direct conversion of elemental nitrogen, in which a substrate vapor of a simple organic compound, e.g. propanol is mixed with a carrier gas at least partly comprising nitrogen and the vapor mixture is passed over a catalyst, e.g. of a transition metal, and irradiated with microwave radiation to produce a simple organo-nitrogen compound.
    Type: Grant
    Filed: May 7, 1996
    Date of Patent: March 24, 1998
    Assignees: Gecalsthom Limited, Isambard Services Limited
    Inventors: David John Harper, Ronald Michael Henson, David John Wheeler