Patents by Inventor Paul R. Ewalt

Paul R. Ewalt 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 locking device
    Patent number: 4610672
    Abstract: A locking device attached to the exterior of a syringe barrel includes a flat body having a circular opening therein for passage of a syringe plunger reciprocatably therethrough. Arms depend from the flat body to frictionally hold the device against rotation with respect to the syringe barrel when a syringe plunger is rotated to engage the locking device. At least two ridges extend chordally across the circular opening, the distance between the ridges being selected so that the ridges engage the syringe plunger when the plunger is oriented in one position but not when the plunger is oriented in another position.
    Type: Grant
    Filed: June 10, 1985
    Date of Patent: September 9, 1986
    Assignee: Sherwood Medical Company
    Inventors: Paul R. Ewalt, Harold G. Leigh, Richard W. Gilson