Patents by Inventor Hugh W. Pratt

Hugh W. Pratt 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).

  • Disposable pipette tips and trays therefor
    Patent number: 4349109
    Abstract: An improved disposable pipette tip adapted to nest one within another and having a steeply tapered side wall to minimize the length to volume ratio of the tip. An improved self standing tray for the tip also is disclosed as is a new package for pipette tips.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: September 14, 1982
    Assignee: Medical Laboratory Automation, Inc.
    Inventors: Emil A. Scordato, Hugh W. Pratt
  • Pipettes
    Patent number: 4164870
    Abstract: A fixed stroke pipette having a measuring piston that controls the volume of liquid aspirated into the pipette reservoir and a larger piston that assures the expulsion of all the aspirated liquid during a discharge stroke. An improved piston arrangement provides a fixed seal for the air chamber in which the measuring piston moves and a separate air passageway to that air chamber, controlled by a spring biased check valve, through which compressed air is delivered to the pipette reservoir during a discharge stroke.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: August 21, 1979
    Assignee: Medical Laboratory Automation, Inc.
    Inventors: Emil A. Scordato, Hugh W. Pratt