Patents by Inventor David Howard Dumas

David Howard Dumas 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).

  • 2-oxetanone sizing agents and their use in paper
    Patent number: 6316095
    Abstract: Fine paper that is sized with a 2-oxetanone alkaline sizing agent and that does not encounter machine feed problems in high speed converting or reprographic machines, including continuous forms bond paper and adding machine paper, processes for converting the paper into envelopes, continuous forms bond paper and adding machine paper, and paper products of the processes.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: November 13, 2001
    Assignee: Hercules Incorporated
    Inventors: Donald K. Black, Kyle J. Bottorff, Clement Linus Brungardt, David Howard Dumas, Susan Merrick Ehrhardt, John Charles Gast, Jian-Jian Zhang
  • Process of using fine paper containing 2-oxetanone sizing agent in high speed precision converting or reprographic operations
    Patent number: 6007906
    Abstract: Fine paper that is sized with a 2-oxetanone alkaline sizing agent and that does not encounter machine feed problems in high speed converting or reprographic machines, including continuous forms bond paper and adding machine paper, processes for converting the paper into envelopes, continuous forms bond paper and adding machine paper, and paper products of the processes.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: December 28, 1999
    Assignee: Hercules Incorporated
    Inventors: Kyle J. Bottorff, Clement Linus Brungardt, David Howard Dumas, Susan Merrick Ehrhardt, John Charles Gast, Jian-Jian Zhang
  • Pretreatment of filler with cationic ketene dimer
    Patent number: 5972100
    Abstract: A filler of inorganic particles, cellulose reactive size and cationic dispersing agent is provided, the use of which results in the capability to obtain the desired sizing level practically unaffected by the level of filler addition.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: October 26, 1999
    Assignee: Hercules Incorporated
    Inventor: David Howard Dumas
  • Process of using paper containing alkaline sizing agents with improved conversion capability
    Patent number: 5685815
    Abstract: Fine paper that is sized with a 2-oxetanone alkaline sizing agent and that does not encounter machine feed problems in high speed converting or reprographic machines, including continuous forms bond paper and adding machine paper, processes for converting the paper into envelopes, continuous forms bond paper and adding machine paper, and paper products of the processes.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: November 11, 1997
    Assignee: Hercules Incorporated
    Inventors: Kyle J. Bottorff, Clement Linus Brungardt, David Howard Dumas, Susan Merrick Ehrhardt, John Charles Gast, Jian-Jian Zhang
  • Water-dispersible thermosettable cationic resins from reaction of (1) water soluble amino polyamide, (2) acid anhydride and (3) epihalohydrin
    Patent number: 4087395
    Abstract: Disclosed are novel water-insoluble, water-dispersible thermosettable cationic resins derived by reaction of a water-soluble aminopolyamide, a hydrophobizing compound such as a ketene dimer and an epihalohydrin such as epichlorohydrin. The thermosettable cationic resins are water-dispersible, and aqueous dispersions thereof are stable for prolonged periods of time at relatively high solids concentration. The thermosettable cationic resins have particular utility in the sizing of paper.
    Type: Grant
    Filed: April 13, 1977
    Date of Patent: May 2, 1978
    Assignee: Hercules Incorporated
    Inventors: Paul Harwood Aldrich, David Howard Dumas