Patents by Inventor Erwin Jedamzik

Erwin Jedamzik 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).

  • Gas tightly sealed joint in oil field tubular goods
    Patent number: 4595219
    Abstract: A pin member with conical thread is threaded into a box or sleeve member having matching conical threading with abutment of the end of the box or sleeve against a shoulder on the pin member; that shoulder is continued into a groove in the pin member receiving a conically distorted polytetrafluoroethylene ring sealingly cooperating with a frustoconical surface of the box or sleeve member near its abutment end. The ring has been placed into the groove after having been heated to a temperature above the crystalline/amorphous transition temperature but below the liquification and decomposition temperatures.
    Type: Grant
    Filed: January 31, 1983
    Date of Patent: June 17, 1986
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Friedrich Lenze, Erwin Jedamzik