Patents by Inventor Eric L. Sandstrom

Eric L. Sandstrom 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).

  • Filter element and spiral-wound membrane cartridge containing same
    Patent number: 5114582
    Abstract: An improved spiral membrane cartridge is provided, comprising one or more filter elements, spirally wound on a cylindrical permeate transport tube. Each filter element comprises a heat-sealed membrane element and a feed spacer. The spiral membrane cartridge of the invention contains no adhesives, improving the reliability and durability of the cartridge. The invention further provides a method for making such an improved membrane cartridge, and the membrane elements used therein.
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: May 19, 1992
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Eric L. Sandstrom, Alfred Prokop, William H. Young, II, Anthony M. D'Urso
  • Membrane separation equipment
    Patent number: 3984319
    Abstract: In a membrane separation device means for mounting a semi-permeable membrane separation unit on the sidewall of a casing including a plug member and releasable interlocking means for interconnecting the plug and separation unit to the sidewall with the plug member including permeate outlet means for discharging permeate from the separation unit.
    Type: Grant
    Filed: January 6, 1975
    Date of Patent: October 5, 1976
    Assignee: Dorr-Oliver Incorporated
    Inventors: Peter J. Hubbard, Eric L. Sandstrom