Patents by Inventor Terje Karlsen

Terje Karlsen 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).

  • Stabilizer length coding system
    Patent number: 5931606
    Abstract: A system for providing a visual body-length indicator for a group of mine roof stabilizers of various, unique lengths includes providing each stabilizer with a tubular body and a slot along the body. A bottom annular ring having a ring gap formed therein is attached to the body, with the ring gap and body slot being oriented in a unique relation for each unique body length, providing a visual indicator of body length that can be observed from a distance, even after the stabilizer is installed into a drill hole in a mine roof.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: August 3, 1999
    Assignee: Ingersoll-Rand Company
    Inventor: Terje Karlsen