Patents by Inventor Michael Barry Heard

Michael Barry Heard 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).

  • Manufacture of paper and paperboard
    Patent number: 6406593
    Abstract: A process of making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, mechanically shearing the suspension and optionally reflocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, wherein the suspension is flocculated or reflocculated by introducing a water-soluble polymer of intrinsic viscosity above 3 dl/g into the suspension, characterized in that the water soluble polymer exhibits a rheological oscillation value of tan delta at 0.005 Hz of above 1.1. The process has the advantage of improving retention.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: June 18, 2002
    Assignee: Ciba Specialty Chemicals Water Treatments Ltd.
    Inventors: Michael Barry Heard, Gordon Cheng I Chen