Patents by Inventor Margaret D. Ellis

Margaret D. Ellis 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).

  • Process for removal of copper ions from aqueous effluent
    Patent number: 5133873
    Abstract: This invention relates to a process for removing copper ions from highly acidic waste water generated during the manufacture of dyes or pigments or intermediates thereof. The waste water is exposed at a pH less than about 1 to a bed of suspended iron particles, preferably a fluidized bed of iron particles, having a particle size of from about 200 to about 950 micrometers.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: July 28, 1992
    Assignee: Miles Inc.
    Inventors: Joseph C. Catlin, Margaret D. Ellis, James J. Good, Mark A. Putnam, Neal E. Tonks, Donald V. Wood
  • Removal of excess halide ions in aqueous liquid formulations of basic dyestuffs
    Patent number: 4813974
    Abstract: There is disclosed a procedure for reducing the halide content of cationic or basic dyes and consequently the corrosive effect of aqueous formulations of these dyes on stainless steel. The dyes are incorporated into aqueous formulation which may range from neutral to acidic and exposed to an anionic exchange resin. Suitable techniques include stirring beads of the resin into the aqueous formulation and passing the aqueous formulation through an ion exchange column.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: March 21, 1989
    Assignee: Mobay Corporation
    Inventors: Susan M. Morris, Margaret D. Ellis, Thomas J. Thomas