Patents by Inventor Arthur Everett Bergstrom

Arthur Everett Bergstrom 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 blast joint
    Patent number: 4028796
    Abstract: The present application discloses and claims the method of producing a blast joint for oil well production tubing. The method disclosed and claimed herein relates to assembling, upon the exterior of a length of production tubing, a stack of short length refractory rings resistant to abrasion and capable of enduring high temperature, to be used in a string of oil well production tubing.
    Type: Grant
    Filed: June 23, 1976
    Date of Patent: June 14, 1977
    Inventor: Arthur Everett Bergstrom