Patents by Inventor Ake E. Ronnkvist

Ake E. Ronnkvist 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).

  • Composite sucker rod and method of manufacturing same
    Patent number: 4432662
    Abstract: A sucker rod is composed of three initially separate parts comprising a relatively long body member and duplicate relatively short pin members. Upsetting steps are performed on the relatively long body member, whereas only machining steps are employed in making the pin members. One end of each pin member is inertia welded to each end of the body member after the various ends have been cut or ground to provide relatively smooth surfaces.
    Type: Grant
    Filed: August 13, 1981
    Date of Patent: February 21, 1984
    Inventor: Ake E. Ronnkvist