Patents by Inventor Charles D. Griffin

Charles D. Griffin 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).

  • Stapled heart prosthesis and method of installing same
    Patent number: 6241765
    Abstract: A prosthetic heart valve is disclosed which has a rigid shoulder with staple receiving means. Using the staple receiving means of the shoulder, the heart valve may be secured within the heart by stapling the shoulder of the prosthesis to the patient's tissue. Such a prosthesis is advantageous in that it may be secured in a much shorter time period than conventional valves thereby reducing the risks and complications of surgery.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: June 5, 2001
    Assignee: Sulzer Carbomedics Inc.
    Inventors: Charles D. Griffin, Arthur A. Alfaro
  • Processor chemistry control strip reader and replenishment system
    Patent number: 4985320
    Abstract: A voltage set point system is employed to provide a constant illumination of a photographic test strip. The set voltage is used as the supply for a voltage divider comparator network for accurately determining exposed film density levels.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Charles D. Griffin