Patents by Inventor John L. Burns, Jr.

John L. Burns, Jr. 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).

  • Dual media filter cartridge construction
    Patent number: 5980759
    Abstract: A filter cartridge is provided which includes (a) a wound depth filter or a cylindrical seamless depth filter and (b) a pleated filter having a lower micron retention rating than the depth filter. The depth filter and pleated filter surround a central opening. The cartridge is sealed and an appropriate inlet or outlet is provided in order to assure sequential fluid flow first through the depth filter and then through the pleated filter.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 9, 1999
    Assignee: Millipore Corporation
    Inventors: Stephen Proulx, Frank M. Lentine, John L. Burns, Jr.
  • Current flow integrity test
    Patent number: 5477155
    Abstract: A new method and apparatus is described for conducting an integrity test on porous membranes and membrane filters and for conducting a pore-size characterization of membrane. The method and apparatus apply to membrane integrity tests and pore-size characterizations which are based on the dependence on the pore size of the pressure required to intrude a non-wetting, electrically conductive liquid into and through the pores. Electrical-measurement methods are described for identifying the pressure at which intrusion occurs.
    Type: Grant
    Filed: August 11, 1993
    Date of Patent: December 19, 1995
    Assignee: Millipore Corporation
    Inventors: Stephen Proulx, John L. Burns, Jr., Scott Emory, Richard W. Gray, Frank M. Lentine