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: 7179382Abstract: 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: GrantFiled: November 5, 2002Date of Patent: February 20, 2007Assignee: MeadWestvaco CorporationInventors: Laurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
-
Patent number: 6696384Abstract: 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: GrantFiled: April 11, 2001Date of Patent: February 24, 2004Assignee: MeadWestvaco CorporationInventors: Peter D. A. McCrae, Tiejun Zhang, David R. B. Walker
-
Publication number: 20030118823Abstract: 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: ApplicationFiled: November 5, 2002Publication date: June 26, 2003Applicant: Westvaco CorporationInventors: Laurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
-
Patent number: 6573212Abstract: 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: GrantFiled: April 11, 2001Date of Patent: June 3, 2003Assignee: MeadWestvaco CorporationInventors: Peter D. A. McCrae, Tiejun Zhang, David R. B. Walker
-
Publication number: 20030082382Abstract: 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: ApplicationFiled: November 5, 2002Publication date: May 1, 2003Applicant: Westvaco CorporationInventors: Laurence H. Hiltzik, Edward D. Tolles, David R. B. Walker
-
Publication number: 20030020198Abstract: 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: ApplicationFiled: April 11, 2001Publication date: January 30, 2003Applicant: Westvaco CorporationInventors: Peter D.A. McCrae, Tiejun Zhang, David R.B. Walker
-
Publication number: 20030022787Abstract: 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: ApplicationFiled: April 11, 2001Publication date: January 30, 2003Applicant: Westvaco CorporationInventors: Peter D.A. McCrae, Tiejun Zhang, David R.B. Walker
-
Publication number: 20020160179Abstract: 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: ApplicationFiled: April 23, 2002Publication date: October 31, 2002Applicant: Westvaco CorporationInventors: Nipun Marwah, David R. B. Walker, Ramazan Benrashid, Louie R. Hancock, Harry W. Robertson, Bruce T. Wright
-
Patent number: 6472343Abstract: 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: GrantFiled: April 11, 2001Date of Patent: October 29, 2002Assignee: Westvaco CorporationInventors: Peter D. A. McCrae, Tiejun Zhang, David R. B. Walker
-
Patent number: 5262056Abstract: 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: GrantFiled: November 30, 1992Date of Patent: November 16, 1993Assignee: Board of Regents, The University of Texas SystemInventors: William J. Koros, David R. B. Walker