Patents by Inventor Keith Callen

Keith Callen 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).

  • Pressure control systems for medical injectors and syringes used therewith
    Patent number: 6488661
    Abstract: The present invention provides a pressure control system for an injector. The pressure control system includes a compliant piston or piston extension member that connects to the plunger of a injector-actuated syringe to prevent pressure overshoots when a closed or blocked fluid delivery pathway is encountered during an injection procedure.
    Type: Grant
    Filed: October 8, 1999
    Date of Patent: December 3, 2002
    Assignee: Medrad, Inc.
    Inventors: Michael A. Spohn, Keith Callen