Patents by Inventor John S. Ploof

John S. Ploof 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).

  • End of dose indicator
    Patent number: 5391157
    Abstract: The present invention provides an improvement in injection syringes by providing for an end of dose indicator which is operatively associated with the dose knob of an injection syringe. The instant end of dose indicator works by providing a sound as an indication that the complete dose has been administered.
    Type: Grant
    Filed: October 20, 1992
    Date of Patent: February 21, 1995
    Assignee: Eli Lilly and Company
    Inventors: Dale C. Harris, John S. Ploof