Patents by Inventor Leo T. Mulcahy

Leo T. Mulcahy 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).

  • Patent number: 5597447
    Abstract: A method is disclosed for producing, in a continuous throughput, high quality paper from recycled waste paper utilizing high consistency, low shear pulping, followed by a series of cleaning steps to produce a wet, friable pulp which is digested and optionally bleached. The resulting pulp can be run on a paper machine alone or blended with virgin pulp to produce a paper containing at least 5 by weight recycled paper with less than 20 ppm per unit area solid non-fibrous contaminants larger than 0.3 mm.sup.2, and which may be blade coated on a high speed paper machine. A blade coated paper produced by the method is disclosed.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 28, 1997
    Assignee: Westvaco Corporation
    Inventors: Mark A. Hank, Leo T. Mulcahy, Ralph S. Peterson, Robert C. Streisel
  • Patent number: 5587048
    Abstract: A method is disclosed for producing, in a continuous throughput, high quality paper from recycled waste paper utilizing high consistency, low shear pulping, followed by a series of cleaning steps to produce a wet, friable pulp which is digested and optionally bleached. The resulting pulp can be run on a paper machine alone or blended with virgin pulp to produce a paper containing at least 5% by weight recycled paper with less than 20 ppm per unit area solid non-fibrous contaminants larger than 0.3 mm.sup.2, and which may be blade coated on a high speed paper machine. The pulp and paper produced by the methods are also disclosed.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: December 24, 1996
    Assignee: Westvaco Corporation
    Inventors: Robert C. Streisel, Mark A. Hank, Leo T. Mulcahy, Ralph S. Peterson
  • Patent number: 5538594
    Abstract: A method is disclosed for producing, in a continuous throughput, high quality paper from recycled waste paper utilizing high consistency, low shear pulping, followed by a series of cleaning steps to produce a wet, friable pulp which is digested and optionally bleached. The resulting pulp can be run on a paper machine alone or blended with virgin pulp to produce a paper containing at least 10% by weight recycled paper with less than 20 ppm per unit area solid non-fibrous contaminants larger than 0.3 mm.sup.2, and which may be blade coated on a high speed paper machine.
    Type: Grant
    Filed: January 9, 1995
    Date of Patent: July 23, 1996
    Assignee: Westvaco Corporation
    Inventors: Mark A. Hank, Leo T. Mulcahy, Ralph S. Peterson, Robert C. Streisel