Patents by Inventor John E. Robinson

John E. Robinson 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: 4063662
    Abstract: Calibrating means for a microdispenser of the type wherein a plunger is operable to automatically draw a fixed volume of fluid into, and expel the liquid from, a precision capillary tube. The calibrating means includes a graduation marking on the capillary tube indicating the precise, predetermined quantity of fluid to be drawn into the tube. Calibration is effected by varying the degree of engagement of the microdispenser end cap with the microdispenser barrel, which effects corresponding longitudinal movement of the plunger with respect to the capillary tube until the outer terminal thereof is aligned with the graduation marking on the capillary tube. Friction means are provided for preventing accidental movement of the end cap after the calibration adjustment has been made.
    Type: Grant
    Filed: July 8, 1976
    Date of Patent: December 20, 1977
    Assignee: Drummond Scientific Company
    Inventors: Michael E. Drummond, John E. Robinson
  • Patent number: D245241
    Type: Grant
    Filed: June 25, 1976
    Date of Patent: August 2, 1977
    Inventor: John E. Robinson