Patents by Inventor John J. Riddle

John J. Riddle 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).

  • Patent number: 5762635
    Abstract: A retractable needle syringe that includes a barrel assembly, a plunger assembly, and a needle assembly. The plunger assembly is movably mounted in the barrel assembly. And, the needle assembly is movably mounted in the barrel assembly and engagable with the plunger assembly, so that after the retractable needle syringe has been used, the plunger assembly is engaged with the needle assembly, the plunger assembly is pulled, and the needle assembly is drawn into the barrel assembly.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: June 9, 1998
    Inventors: Paul A. Pace, John J. Riddle