Patents by Inventor Gunnar T. Soderstrom

Gunnar T. Soderstrom 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 of making a rotary drill bit
    Patent number: 4627882
    Abstract: A rotary drill bit comprising a roller cutter (13) rotatably carried over a bearing system, which comprises a friction bearing (14). For purposes of ensuring sufficient hardness of the cooperating friction surfaces and lubrication thereof and optimizing cutting ability and fatigue resistance the bearing surface (28) of the roller cutter (13) is surface-hardened by means of a thermal hardening method and provided with a solid lubricant (27), and the bearing surface (29) of the bearing pin (12) is provided with a wear resistant deposit having higher wearability than the surface-hardened bearing surface.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: December 9, 1986
    Assignee: Santrade Limited
    Inventor: Gunnar T. Soderstrom