Patents by Inventor John J. Sheehan

John J. Sheehan 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).

  • Use of chitosan to improve membrane filter performance
    Patent number: 4970001
    Abstract: Improvement in cross-flow membrane filtration. Chitosan is admixed with an aqueous dispersion of colloids or finely divided solids to flocculate the solids. The chitosan-flocculated liquid is then filtered on a membrane by cross-flow under pressure. A layer of chitosan-containing flocculant material deposits on the membrane and provides superior flux performance as compared to certain commerical flocculants.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: November 13, 1990
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: John J. Sheehan
  • Pry tool for plastic tubs or the like
    Patent number: D263673
    Type: Grant
    Filed: February 21, 1980
    Date of Patent: April 6, 1982
    Inventor: John J. Sheehan
  • Caster boot
    Patent number: D342667
    Type: Grant
    Filed: April 29, 1992
    Date of Patent: December 28, 1993
    Inventor: John J. Sheehan, Jr.