Patents by Inventor Stanley Pfeifer

Stanley Pfeifer 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).

  • Purging means for aperture of blood cell counter
    Patent number: 4180091
    Abstract: A system for purging the aperture and surrounding portions of a blood cell counter of dirt, debris, and previous sample liquid. A sample tube extends from a source of either sample liquid or cleansing solution to a small gap between the aperture and housing assembly. A purge line is connected between an annular portion surrounding the gap and a pump which supplies negative pressure. Due to the geometry of the sample tube, gap, annulus, and purge line, a high pressure drop occurs across the gap and the liquid flows at relatively high velocity past the aperture to facilitate cleaning.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: December 25, 1979
    Assignee: Becton, Dickinson and Company
    Inventors: John P. Hanley, Pasquale M. Petrucci, Stanley Pfeifer