Patents by Inventor David M. Harriss

David M. Harriss 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).

  • Fungus resistant gypsum-based substrate
    Publication number: 20040092190
    Abstract: The present invention relates to a fungus resistant gypsum board, made of first and second polymeric fibrous sheets with a gypsum core sandwiched there between. The gypsum core containing less than 0.03% of formulation additives that serve as fungus nutrients and less than 0.5% of the dry gypsum core contains of fungus nutrients. The fibrous sheets are preferably nonwovens and the gypsum core preferably contains a fungicide. The invention is also directed to a process for making a fungus resistant gypsum board.
    Type: Application
    Filed: November 6, 2003
    Publication date: May 13, 2004
    Inventors: Robert B. Bruce, David M. Harriss
  • Fungus resistant gypsum-based substrate
    Patent number: 6703331
    Abstract: The present invention relates to a fungus resistant gypsum board, made of first and second polymeric fibrous sheets with a gypsum core sandwiched there between. The gypsum core containing less than 0.03% of formulation additives that serve as fungus nutrients and less than 0.5% of the dry gypsum core contains of fungus nutrients. The fibrous sheets are preferably nonwovens and the gypsum core preferably contains a fungicide. The invention is also directed to a process for making a fungus resistant gypsum board.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: March 9, 2004
    Assignees: E. I. du Pont de Nemours and Company, Innogyps, Inc.
    Inventors: Robert B. Bruce, David M. Harriss
  • Fungus resistant gypsum-based substrate
    Publication number: 20030037502
    Abstract: The present invention relates to a fungus resistant gypsum board, made of first and second polymeric fibrous sheets with a gypsum core sandwiched there between. The gypsum core containing less than 0.03% of formulation additives that serve as fungus nutrients and less than 0.5% of the dry gypsum core contains of fungus nutrients. The fibrous sheets are preferably nonwovens and the gypsum core preferably contains a fungicide. The invention is also directed to a process for making a fungus resistant gypsum board.
    Type: Application
    Filed: October 21, 2002
    Publication date: February 27, 2003
    Inventors: Robert B. Bruce, David M. Harriss
  • Gypsum-based construction material
    Patent number: 6485821
    Abstract: The present invention relates to a process for manufacturing a gypsum-based substrate. The process includes the steps mixing gypsum and water to produce a gypsum slurry, providing a synthetic polymeric fibrous sheet on one side of a layer of the gypsum slurry, and adhering to the wet gypsum to the sheet with an adhesive strength of at least 7.5 lb. The present invention is also directed to a gypsum board comprised of first and second polymeric fibrous sheets adhered to opposite sides of a wet gypsum core, wherein the first surface of the first sheet and the first surface of the second sheet have pores containing set gypsum and the first and second sheets adhere to said wet gypsum core with an adhesive strength of at least 7.5 lb.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: November 26, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert B. Bruce, David M. Harriss
  • Flash-spun sheet material
    Patent number: 6010970
    Abstract: Improved sheets of bonded plexifilamentary film-fibril strands spun from a polyolefin and a pigment are provided. The polyolefin comprises at least 90% by weight of the fibril strands, and the pigment comprises between 0.05% and 10% by weight of the fibril strands. The sheet has a high opacity and high smoothness, even when the sheet is bonded to a delamination strength greater than 120 N/m or when subjected to calendering. The sheet material is highly printable.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: January 4, 2000
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: David Jackson McGinty, Stasys K. Rudys, David M. Harriss
  • Process for making high elongation PPD-T fibers
    Patent number: 5330698
    Abstract: A process for making a PPD-T fiber having an elongation to break of greater than 7%.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: July 19, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Steven R. Allen, David M. Harriss