Patents by Inventor John A. Hedlund

John A. Hedlund 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).

  • Profiled tire tread
    Patent number: 4239075
    Abstract: A precured tire tread for use in retreading tires contoured to have a flat road-contacting tread surface when applied to the casing.
    Type: Grant
    Filed: July 14, 1977
    Date of Patent: December 16, 1980
    Inventor: John A. Hedlund
  • Method of retreading a pneumatic tire
    Patent number: 4137112
    Abstract: A method of retreading a pneumatic tire. The tire casing is buffed to a predetermined profile to remove the old tread. A cushion layer having an integral belt disposed therein is wrapped circumferentially around the casing and attached thereto. A precured tread having an integral belt disposed therein is wrapped circumferentially over the cushion and attached to the casing and cushion. The tire is cured to form a unitary structure.
    Type: Grant
    Filed: July 22, 1977
    Date of Patent: January 30, 1979
    Assignee: The Hercules Tire & Rubber Company
    Inventor: John A. Hedlund