Patents by Inventor Douglas H. Hemphill

Douglas H. Hemphill 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).

  • Combined foam and inflatable collar assemblies for watercraft
    Patent number: 6371040
    Abstract: Alternative collar assemblies for use with watercraft including rigid-hulled boats are described. The collars may include both foam materials and one or more inflatable compartments, thereby offering multiple advantages over existing foam or inflatable collars. Optionally included in or on the collars are reinforcing material (such as but not limited to Kevlar) and an abrasion-resistant coating surrounding the foam and inflatable compartments.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: April 16, 2002
    Assignee: Zodiac Hurricane Technologies, Inc.
    Inventors: Douglas H. Hemphill, Gary Dale
  • Collar assembly for watercraft
    Patent number: 6371039
    Abstract: Collar assemblies for use with watercraft including rigid-hulled boats are disclosed. Collars of the assemblies may surround or envelope all or most of the perimeters of boats and provide increased buoyancy at least at their sterns. The collars typically are split, rather than continuous, both to facilitate installation and to reduce risk of damage during the installation process.
    Type: Grant
    Filed: January 25, 2000
    Date of Patent: April 16, 2002
    Assignee: Zodiac Hurricane Technologies, Inc.
    Inventor: Douglas H. Hemphill