Patents by Inventor Knut O. Edman

Knut O. Edman 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).

  • Method for overburden drilling, casing shoe and casing tube for the method, and coupling element for the casing tubes
    Patent number: 5542483
    Abstract: When drilling in soil and simultaneous loading of casing tube, it is desirable to be able to use casing tubes of plastic material such as PEH-plastic. This is made possible by a special design of a casing shoe giving a strong joint between the casing shoe and the casing tube. The casing shoe is made of metal and has a part which is perforated with holes filled with the plastic material. Tube couplings between the casing tubes can also be joined to the tubes in the same way as the casing shoe. In other words, they can be made of metal and each have one part perforated with holes filled with the plastic material.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: August 6, 1996
    Inventor: Knut O. Edman