Patents by Inventor William R. Friehler

William R. Friehler 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).

  • Reagent separator for a blood collection tube
    Patent number: 4279863
    Abstract: An apparatus (10,50) is provided for physically retaining a reagent (17) in a blood collection tube (11) separate from a blood sample until the tube (11) is centrifuged. The apparatus includes a cup-shaped flexible barrier (10,50) placed over the reagent (17) disposed in the bottom of the tube (11). The barrier (10,50) seals with the inner wall of the tube (11) and prevents the reagent (17) from entering the tube's upper evacuated chamber (12,55) into which the blood sample is drawn. The seal maintains the barrier (10,50) in position until the tube (11) is centrifuged whereupon the barrier (10,50) moves to the bottom of the tube (11) causing the reagent (17) to flow past the barrier (10,50) to mix with the blood sample.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: July 21, 1981
    Assignee: Sherwood Medical Industries, Inc.
    Inventor: William R. Friehler