Patents by Inventor David J. Duncan

David J. Duncan 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: 11911272
    Abstract: Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that include a plurality of absorbable filaments arranged in a support structure and configured degrade within a defined time period and a membrane arranged about the plurality of absorbable filaments and configured to contain fragments of the plurality of absorbable filaments in response to a fracture or degradation of a filament.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: February 27, 2024
    Assignee: W. L. Gore & Associates, Inc.
    Inventors: Michael C. Chan, Edward H. Cully, Jeffrey B. Duncan, Byron K. Hayes, Samuel Joynson, Tom R. McDaniel, David J. Messick, Edward E. Shaw
  • Patent number: 5227436
    Abstract: Epoxy-containing compounds are prepared by dehydrohalogenating the reaction product of an epihalohydrin with the reaction product of a compound containing an average of more than one aromatic hydroxyl group per molecule with an alkylene oxide wherein the ratio of moles of epihalohydrin to hydroxyl groups is at least about 1.2:1. When these epoxy containing compounds are formulated into coatings, the resultant products have improved chemical resistance to acids.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: July 13, 1993
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, Dennis L. Steele, David J. Duncan
  • Patent number: 5145919
    Abstract: Epoxy-containing compounds are prepared by dehydrohalogenating the reaction product of an epihalohydrin with the reaction product of a compound containing an average of more than one aromatic hydroxyl group per molecule with an alkylene oxide wherein the ratio of moles of epihalohydrin to hydroxyl groups is at least about 1.2:1. When these epoxy containing compounds are formulated into coatings, the resultant products have improved chemical resistance to acids.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: September 8, 1992
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, Dennis L. Steele, David J. Duncan
  • Patent number: 5057552
    Abstract: Flexible thermoplastic epoxy resins are prepared by reacting (1) an advanced epoxy resin prepared by reacting a mixture of an aromatic based epoxy resin and an aliphatic based epoxy resin with a polyhydric phenol in the presence of an advancement catalyst with (2) a monocarboxylic acid or anhydride thereof; reacting the resultant product with a mixture of an aromatic based epoxy resin and a monofunctional material reactive with vicinal epoxy groups; and reacting the resultant product with a carboxyl terminated elastomer. These resins are particularly useful in formulating pavement marking paints.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: October 15, 1991
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, David J. Duncan
  • Patent number: 5011904
    Abstract: Epoxy-containing compounds are prepared by dehydrohalogenating the reaction product of an epihalohydrin with the reaction product of a compound containing an average of more than one aromatic hydroxyl group per molecule with an alkylene oxide wherein the ratio of moles of epihalohydrin to hydroxyl groups is at least about 1.2:1. When these epoxy containing compounds are formulated into coatings, the resultant products have improved chemical resistance to acids.
    Type: Grant
    Filed: November 20, 1989
    Date of Patent: April 30, 1991
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, Dennis L. Steele, David J. Duncan
  • Patent number: 4876295
    Abstract: Flexible thermoplastic epoxy resins are prepared by reacting (1) an advanced epoxy resin prepared by reacting a mixture of an aromatic based epoxy resin and an aliphatic based epoxy resin with a polyhydric phenol in the presence of an advancement catalyst with (2) a monocarboxylic acid or anhydride thereof; reacting the resultant product with a mixture of an armotic based epoxy resin and a monofunctional material reactive with vicinal epoxy groups; and reacting the resultant product with a carboxyl terminated elastomer. These resins are particularly useful in formulating pavement marking paints.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: October 24, 1989
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, David J. Duncan
  • Patent number: 4837248
    Abstract: Flexible thermoplastic epoxy resins are prepared by reacting (1) an advanced epoxy resin prepared by reacting a mixture of an aromatic based epoxy resin and an aliphatic based epoxy resin with a polyhydric phenol in the presence of an advancement catalyst with (2) a monocarboxylic acid or anhydride thereof; reacting the resultant product with a mixture of an aromatic based epoxy resin and a monofunctional material reactive with vicinal epoxy groups; and reacting the resultant product with a carboxyl terminated elastomer. These resins are particularly useful in formulating pavement marking paints.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: June 6, 1989
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, David J. Duncan
  • Patent number: 4755542
    Abstract: Flexible thermoplastic epoxy resins are prepared by reacting (1) an advanced epoxy resin prepared by reacting a mixture of an aromatic based epoxy resin and an aliphatic based epoxy resin with a polyhydric phenol in the presence of an advancement catalyst with (2) a monocarboxylic acid or anhydride thereof; reacting the resultant product with a mixture of an aromatic based epoxy resin and a monofunctional material reactive with vicinal epoxy groups; and reacting the resultant product with a carboxyl terminated elastomer. These resins are particularly useful in formulating pavement marking paints.
    Type: Grant
    Filed: March 11, 1987
    Date of Patent: July 5, 1988
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, David J. Duncan
  • Patent number: 4602070
    Abstract: An advanced epoxy resin is prepared by reacting in the presence of a suitable catalyst such as ethyltriphenyl phosphonium acetate.acetic acid complex (A) a mixture containing (1) a polyglycidyl ether of a material containing at least two aliphatic hydroxyl groups per molecule such as a diglycidyl ether of a polyoxypropylene glycol and (2) a dicarboxylic acid such as malonic acid with (B) a dihydric phenol such as bisphenol A. These advanced epoxy resins are useful in the preparation of automobile paints, exterior coatings for beverage cans, coil coatings and adhesives.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: July 22, 1986
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, David J. Duncan
  • Patent number: 4544731
    Abstract: The increase in hydrolyzable halide content in the preparation of advanced epoxy resins is decreased by conducting the advancement in the presence of an unsaturated organic compound.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: October 1, 1985
    Assignee: The Dow Chemical Company
    Inventors: Michael B. Cavitt, David J. Duncan
  • Patent number: 4143099
    Abstract: A method of preparing a thermoplastic elastomeric blend comprising mixing from 90 to 10 parts by weight of monoolefin copolymer rubber with correspondingly from 10 to 90 parts by weight of polyolefin resin having tertiary hydrogen and a free radical generating curing agent therefor, masticating and shearing the mixture to produce a semi-cure of the rubber, completing the semi-cure before the onset of melting of the polyolefin resin, and ensuring that once the polyolefin has melted the level of free radicals remaining in the mixture is not sufficient to cause substantial degradation of the polyolefin.
    Type: Grant
    Filed: May 10, 1976
    Date of Patent: March 6, 1979
    Assignee: Uniroyal Limited
    Inventor: David J. Duncan