Patents by Inventor Christian John Greenfield

Christian John Greenfield 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).

  • Syringe for sequential delivery of different fluids
    Patent number: 7077827
    Abstract: A syringe for sequentially administering different fluids includes a floating piston which separates the syringe into a first portion for receiving a first fluid to be administered and a second portion for receiving a second fluid to be administered. The floating piston includes a fluid tight seal which initially separates the first and second portions of the syringe and apparatus for connecting the second portion of the syringe to the syringe needle after the first fluid has been discharged from the syringe.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: July 18, 2006
    Inventor: Christian John Greenfield
  • Syringe for sequential delivery of different fluids
    Publication number: 20040171984
    Abstract: A syringe for sequentially administering different fluids includes a floating piston which separates the syringe into a first portion for receiving a first fluid to be administered and a second portion for receiving a second fluid to be administered. The floating piston includes a fluid tight seal which initially separates the first and second portions of the syringe and apparatus for connecting the second portion of the syringe to the syringe needle after the first fluid has been discharged from the syringe.
    Type: Application
    Filed: February 27, 2004
    Publication date: September 2, 2004
    Inventor: Christian John Greenfield
  • Syringe for sequential delivery of different fluids
    Publication number: 20040044316
    Abstract: A syringe for sequentially administering different fluids includes a floating piston which separates the syringe into a first portion for receiving a first fluid to be administered and a second portion for receiving a second fluid to be administered. The floating piston includes a fluid tight seal which initially separates the first and second portions of the syringe and a piercing needle which penetrates the fluid tight seal to connect the second portion of the syringe to the syringe needle after the first fluid has been discharged from the syringe.
    Type: Application
    Filed: August 30, 2002
    Publication date: March 4, 2004
    Inventor: Christian John Greenfield