Patents by Inventor Lesley Collett

Lesley Collett 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 making paper
    Patent number: 6475341
    Abstract: Paper is made by mixing anionic starch, carboxyl methyl cellulose or other polymeric binder into a cellulosic thin stock together with a cationic inorganic or polymeric coagulant and then flocculating the suspension by means of an anionic swelling clay or other anionic retention aid.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: November 5, 2002
    Assignee: Ciba Specialty Chemicals Water Treatments Ltd.
    Inventors: Howard Johnston, Lesley Collett
  • Sizing of paper
    Patent number: 6284099
    Abstract: Sizing dispersions of liquid reactive size are made by dispersing the reactive size as a neat liquid into a dispersion of bentonite or other anionic microparticulate material in water. These dispersions can be used for internal sizing, for instance wherein the dispersion is used as the anionic microparticulate stage in a microparticulate retention paper-making process, or they can be used for external sizing.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: September 4, 2001
    Assignee: Ciba Specialty Chemicals Water Treatments Limited
    Inventors: Peter Peutherer, Ian Mark Waring, Lesley Collett