Patents by Inventor Chris Harmston

Chris Harmston 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).

  • Ice screw with non-linear taper
    Patent number: 6505799
    Abstract: An ice screw device for winter, alpine and ice climbing includes a banger couplable to a tubular shank with a screw thread. The tubular shank includes an ice engaging portion configured to be inserted into ice, a tip, and a head portion. The ice engaging portion includes a length and a reverse taper. A majority of the reverse taper of the ice engaging portion is located proximate the tip and within less than half of the length of the ice engaging portion from the tip. In addition, the taper of the ice engaging portion is non-linear. The ice engaging portion of the tubular shank can have at least two sections.. A first section nearer the tip has a first taper different from a second taper of a second section nearer the head portion.
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: January 14, 2003
    Assignee: Black Diamond Equipment, Ltd. Inc.
    Inventors: John Bercaw, Chris Harmston, William J. Reimann, Paul Tusting, Tyler Warner