Patents by Inventor David R. B. Walker

David R. B. Walker 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: 7179382
    Abstract: A method for avoidance of attrited carbon dust is disclosed to lead to improved canister performance in emission control. Product attrition by dusting of granular and shaped activated carbons is disclosed to be reduced significantly, or essentially eliminated, by the application of a thin, continuous polymer coating on the granular or shaped activated carbon, without a reduction in adsorption velocity or capacity of the activated carbon when used in automotive emission control canisters.
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: February 20, 2007
    Assignee: MeadWestvaco Corporation
    Inventors: Laurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
  • Patent number: 6696384
    Abstract: A new shaped activated carbon and the method of its manufacture are disclosed. The invention resides in the crosslinking of a polymeric cellulose, such as sodium carboxymethylcellulose (CMC), within the carbon bodies after they are shaped, employing the CMC as a binder for the activated carbon. The approach to attain product mechanical strength and water stability by crosslinking rather than high temperature heat treatment is not obvious from the prior art teaching. The crosslinking reaction occurs at temperatures below 270° C. In addition, this new binder technology produces shaped carbon bodies having key properties beyond the best level that has been accomplished with other binders.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: February 24, 2004
    Assignee: MeadWestvaco Corporation
    Inventors: Peter D. A. McCrae, Tiejun Zhang, David R. B. Walker
  • Publication number: 20030118823
    Abstract: Product attrition by dusting of granular and shaped activated carbons is disclosed to be reduced significantly, or essentially eliminated, by the application of a thin, continuous polymer coating on the granular or shaped activated carbon, without a reduction in adsorption velocity or capacity of the activated carbon when used in fluid stream filters for removing contaminants. The avoidance of carbon dust leads to improved fluid stream filter performance in contaminant removal.
    Type: Application
    Filed: November 5, 2002
    Publication date: June 26, 2003
    Applicant: Westvaco Corporation
    Inventors: Laurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
  • Patent number: 6573212
    Abstract: A new shaped activated carbon and the method of its manufacture are disclosed. The invention resides in the crosslinking of a polymeric cellulose, such as sodium carboxymethylcellulose (CMC), within the carbon bodies after they are shaped, employing the CMC as a binder for the activated carbon. The approach to attain product mechanical strength and water stability by crosslinking rather than high temperature heat treatment is not obvious from the prior art teaching. The crosslinking reaction occurs at temperatures below 270° C. In addition, this new binder technology produces shaped carbon bodies having key properties beyond the best level that has been accomplished with other binders.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: June 3, 2003
    Assignee: MeadWestvaco Corporation
    Inventors: Peter D. A. McCrae, Tiejun Zhang, David R. B. Walker
  • Publication number: 20030082382
    Abstract: A method for avoidance of attrited carbon dust is disclosed to lead to improved canister performance in emission control. Product attrition by dusting of granular and shaped activated carbons is disclosed to be reduced significantly, or essentially eliminated, by the application of a thin, continuous polymer coating on the granular or shaped activated carbon, without a reduction in adsorption velocity or capacity of the activated carbon when used in automotive emission control canisters.
    Type: Application
    Filed: November 5, 2002
    Publication date: May 1, 2003
    Applicant: Westvaco Corporation
    Inventors: Laurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
  • Publication number: 20030020198
    Abstract: A new shaped activated carbon and the method of its manufacture are disclosed. The invention resides in the crosslinking of a polymeric cellulose, such as sodium carboxymethylcellulose (CMC), within the carbon bodies after they are shaped, employing the CMC as a binder for the activated carbon. The approach to attain product mechanical strength and water stability by crosslinking rather than high temperature heat treatment is not obvious from the prior art teaching. The crosslinking reaction occurs at temperatures below 270° C. In addition, this new binder technology produces shaped carbon bodies having key properties beyond the best level that has been accomplished with other binders.
    Type: Application
    Filed: April 11, 2001
    Publication date: January 30, 2003
    Applicant: Westvaco Corporation
    Inventors: Peter D.A. McCrae, Tiejun Zhang, David R.B. Walker
  • Publication number: 20030022787
    Abstract: A new shaped activated carbon and the method of its manufacture are disclosed. The invention resides in the crosslinking of a polymeric cellulose, such as sodium carboxymethylcellulose (CMC), within the carbon bodies after they are shaped, employing the CMC as a binder for the activated carbon. The approach to attain product mechanical strength and water stability by crosslinking rather than high temperature heat treatment is not obvious from the prior art teaching. The crosslinking reaction occurs at temperatures below 270° C. In addition, this new binder technology produces shaped carbon bodies having key properties beyond the best level that has been accomplished with other binders.
    Type: Application
    Filed: April 11, 2001
    Publication date: January 30, 2003
    Applicant: Westvaco Corporation
    Inventors: Peter D.A. McCrae, Tiejun Zhang, David R.B. Walker
  • Publication number: 20020160179
    Abstract: The present invention discloses an improved paperboard for use in food or non-food products. The disclosed board utilizes a novel method of applying adsorptive material to packaging paperboard to overcome emissions (by adsorption thereof) of odiferous manufacturing components from the board, as well as any offensive odors emitted by contents of packages made from the board. The disclosed approach utilizes known adsorptive materials, which are applied to the pulp stock in such a manner that it does not negatively impact either the appearance or physical attributes of the finished board.
    Type: Application
    Filed: April 23, 2002
    Publication date: October 31, 2002
    Applicant: Westvaco Corporation
    Inventors: Nipun Marwah, David R. B. Walker, Ramazan Benrashid, Louie R. Hancock, Harry W. Robertson, Bruce T. Wright
  • Patent number: 6472343
    Abstract: A new shaped activated carbon and the method of its manufacture are disclosed. The invention resides in the crosslinking of a polymeric cellulose, such as sodium carboxymethylcellulose (CMC), within the carbon bodies after they are shaped, employing the CMC as a binder for the activated carbon. The approach to attain product mechanical strength and water stability by crosslinking rather than high temperature heat treatment is not obvious from the prior art teaching. The crosslinking reaction occurs at temperatures below 270° C. In addition, this new binder technology produces shaped carbon bodies having key properties beyond the best level that has been accomplished with other binders.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: October 29, 2002
    Assignee: Westvaco Corporation
    Inventors: Peter D. A. McCrae, Tiejun Zhang, David R. B. Walker
  • Patent number: 5262056
    Abstract: Polyamide and polypyrrolone membranes for fluid separation having desirable permeabilities, solubilities, diffusivities,, high glass transition temperatures and large fractional free volumes. In particular, the membranes are the polyamide and polypyrrolone forms of hexafluoroisopropylidene-bisphthalic anhydride polymerized with 3,3',4,4' tetraaminodiphenylisopropylidene (6FDA-TADPIP) and polymerized with hexafluorotetraamine (6FDA-6FTA). Fluid separation membranes made from these polymers are described as well as a method of separating fluids using these membranes. Pure gas permeabilities and permeabilities with gas feed mixtures using the fluid separation membranes for feed pressures up to 900 psia indicate desirable permeability and no plasticization effects.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: November 16, 1993
    Assignee: Board of Regents, The University of Texas System
    Inventors: William J. Koros, David R. B. Walker