Patents by Inventor Alfred E. Primm

Alfred E. Primm 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 for producing tubing useful as a tapered vascular graft prosthesis
    Patent number: 4957669
    Abstract: PTFE vascular tubing is guided on to a tapered ultrasonic horn as the horn is oscillating at a high frequency. This action causes the end of the tubing moved onto the horn to expand. The expanded tubing is then positioned on a mandrel having a desired shape, such as tapered, and resintered. The finished tubing with an expanded diameter on one end and a non-expanded diameter on the other end is then removed from the mandrel, and is ready for use. Untapered tubing can also be radially expanded by this method to provide a thinner wall.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: September 18, 1990
    Assignee: Shiley, Inc.
    Inventor: Alfred E. Primm