Patents by Inventor Robert J. C. Foster

Robert J. C. Foster 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).

  • Single fill and use syringe
    Patent number: 5011476
    Abstract: It is an object of the present invention to provide a syringe which is as cheap to manufacture as the standard plastic disposable syringe but which cannot conveniently be reused after it is filled and used once.The syringe comprises a cylindrical barrel (2) and inside the barrel (2) a cylindrical plunger (9) with a resilient base (10) in sealing relation with the barrel (2), the plunger (9) having at least one circumferential groove (13a) and the barrel having an inwardly extending circumferential projection (11) around its aperture (8) such that the projection (11) engages the groove (13a) to prevent withdrawal of the plunger (9).
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: April 30, 1991
    Inventor: Robert J. C. Foster