Patents by Inventor David D. Hawn
David D. Hawn 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).
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Patent number: 9981227Abstract: A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing: i) an azo (—N?N—) content of from 0.40% to 1.00%, as measured by pyrolysis gas chromatography; and ii) a dissociated carboxylate content of at least 0.40 mol/kg as measured by RBS at pH 9.5.Type: GrantFiled: December 15, 2014Date of Patent: May 29, 2018Assignee: Dow Global Technologies LLCInventors: Mou Paul, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, XiaoHua Qiu, Mark A. Rickard, Steven Rosenberg, Abhishek Roy, Ian A. Tomlinson, Chengli Zu
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Patent number: 9662615Abstract: A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method includes the step of applying a polyfunctional amine monomer and polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the step of applying the polyfunctional acyl halide monomer to the porous support includes the step of combining the polyfunctional acyl halide monomer with a non-polar solvent at a concentration of at least 0.18 weight percent to form a coating solution which is applied to the surface of the porous support, and wherein the interfacial polymerization is conducted in the presence of a tri-hydrocarbyl phosphate compound which is provided in a molar ratio of at least 0.5:1 with the polyfunctional acyl halide monomer. Many additional embodiments are described including membranes made from the subject method and applications for such membranes.Type: GrantFiled: July 3, 2013Date of Patent: May 30, 2017Assignee: Dow Global Technologies LLCInventors: Abhishek Roy, Tina L. Arrowood, Robert C. Cieslinski, Derek M. Stevens, David D. Hawn, Steven D. Jons, Mou Paul, Martin H. Peery, Steven Rosenberg, Ian A. Tomlinson
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Patent number: 9630149Abstract: A thin film composite polyamide membrane having a porous support and a thin film polyamide layer comprising a reaction product of m-phenylene diamine (mPD) and trimesoyl chloride (TMC), characterized by the thin film polyamide layer having a critical strain value of less than 10%. In another embodiment, the thin film polyamide layer has a modulus of greater than 0.75 (GPa). In yet another embodiment, the thin film polyamide layer has an equilibrium swelling value of at least 45%. In another embodiment, the thin film polyamide layer has a thickness of at least 230 nm.Type: GrantFiled: July 3, 2013Date of Patent: April 25, 2017Assignee: Dow Global Technologies LLCInventors: Abhishek Roy, Tina L. Arrowood, Anand S. Badami, Robert C. Cieslinski, David D. Hawn, Steven D. Jons, Mou Paul, Steven Rosenberg, Huang Wu
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Patent number: 9616392Abstract: A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing: i) an azo (—N?N—) content of from 0.30% to 0.80%, as measured by pyrolysis gas chromatography; and ii) a dissociated carboxylate content of at least 0.18 mol/kg as measured by RBS at pH 9.5.Type: GrantFiled: December 15, 2014Date of Patent: April 11, 2017Assignee: Dow Global Technologies LLCInventors: Ian A. Tomlinson, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, Mou Paul, XiaoHua Qiu, Mark A. Rickard, Steven Rosenberg, Abhishek Roy, Chengli Zu
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Patent number: 9610542Abstract: A thin film composite membrane including a porous support and a thin film polyamide layer characterized by having a dissociated carboxylate content of at least 0.45 moles/kg at pH 9.5 and a method for making a composite polyamide applying a polar solution comprising a polyfunctional amine monomer and a non-polar solution comprising a polyfunctional amine-reactive monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by the non-polar solution comprising at least 0.025 wt % of an acid compound including at least one carboxylic acid moiety and at least one amine-reactive moiety selected from acyl halide and anhydride.Type: GrantFiled: July 3, 2013Date of Patent: April 4, 2017Assignee: Dow Global Technologies LLCInventors: Abhishek Roy, Tina L. Arrowood, Robert C. Cieslinski, David D. Hawn, Steven D. Jons, Mou Paul, Martin H. Peery, XiaoHua Qiu, Steven Rosenberg, Ian A. Tomlinson, Chengli Zu
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Patent number: 9555378Abstract: A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing an azo (—N?N—) content of from 0.75% to 0.95%, as measured by pyrolysis gas chromatography.Type: GrantFiled: December 15, 2014Date of Patent: January 31, 2017Assignee: Dow Global Technologies LLCInventors: Abhishek Roy, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, Mou Paul, XiaoHua Qiu, Mark A. Rickard, Steven Rosenberg, Ian A. Tomlinson, Chengli Zu
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Publication number: 20160317977Abstract: A method for making a composite polyamide membrane including the step of applying a polar solution including a polyfunctional amine monomer and a non-polar solution comprising a polyfunctional acyl halide monomer to a surface of a porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by including a tri-hydrocarbyl phosphate within the polar coating solution. The thin film polyamide layer is characterized by possessing an equilibrium water swelling factor of greater than 35% as measured by PFT-AFM.Type: ApplicationFiled: December 15, 2014Publication date: November 3, 2016Inventors: Abhishek Roy, Nicholas S. Beck, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, Duane Jacobson, Mou Paul, Carl W. Reinhardt, Katmerka Tabakovic, Ian A. Tomlinson
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Publication number: 20160317980Abstract: A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing: i) an azo (—N?N—) content of from 0.30% to 0.80%, as measured by pyrolysis gas chromatography; and ii) a dissociated carboxylate content of at least 0.18 mol/kg as measured by RBS at pH 9.5.Type: ApplicationFiled: December 15, 2014Publication date: November 3, 2016Inventors: Ian A. Tomlinson, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, Mou Paul, XiaoHua Qiu, Mark A. Rickard, Steven Rosenberg, Abhishek Roy, Chengli Zu
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Publication number: 20160310909Abstract: A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing: i) an azo (—N?N—) content of from 0.40% to 1.00%, as measured by pyrolysis gas chromatography; and ii) a dissociated carboxylate content of at least 0.40 mol/kg as measured by RBS at pH 9.5.Type: ApplicationFiled: December 15, 2014Publication date: October 27, 2016Inventors: Mou PAUL, Robert C. CIESLINSKI, Bruce B. GERHART, David D. HAWN, XiaoHua QIU, Mark A. RICKARD, Steven ROSENBERG, Abhishek ROY, Ian A. TOMLINSON, Chengli ZU
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Publication number: 20160303520Abstract: A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing an azo (—N?N—) content of from 0.75% to 0.95%, as measured by pyrolysis gas chromatography.Type: ApplicationFiled: December 15, 2014Publication date: October 20, 2016Inventors: Abhishek Roy, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, Mou Paul, XiaoHua Qiu, Mark A. Rickard, Steven Rosenberg, Ian A. Tomlinson, Chengli Zu
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Publication number: 20150165387Abstract: A thin film composite polyamide membrane having a porous support and a thin film polyamide layer comprising a reaction product of m-phenylene diamine (mPD) and trimesoyl chloride (TMC), characterized by the thin film polyamide layer having a critical strain value of less than 10%. In another embodiment, the thin film polyamide layer has a modulus of greater than 0.75 (GPa). In yet another embodiment, the thin film polyamide layer has an equilibrium swelling value of at least 45%. In another embodiment, the thin film polyamide layer has a thickness of at least 230 nm.Type: ApplicationFiled: July 3, 2013Publication date: June 18, 2015Inventors: Abhishek Roy, Tina L. Arrowood, Anand S. Badami, Robert C. Cieslinski, David D. Hawn, Steven D. Jons, Mou Paul, Steven Rosenberg, Huang Wu
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Publication number: 20150157990Abstract: A thin film composite polyamide membrane including a porous support and a thin film polyamide layer which is a reaction product of m-phenylene diamine (mPD) and trimesoyl chloride (TMC), wherein the membrane is characterized by the thin film polyamide layer having a dissociated carboxylic acid content of at least 0.18 moles/kg at pH 9.5, and wherein pyrolysis of the thin film polyamide layer at 650 C results in a ratio of responses from a flame ionization detector for fragments produced at 212 m/z and 237 m/z of less than 2.8.Type: ApplicationFiled: July 3, 2013Publication date: June 11, 2015Inventors: Abhishek Roy, Tina L. Arrowood, Anand S. Badami, Robert C. Cieslinski, Bruce B. Gerhart, David D. Hawn, Steven D. Jons, Mou Paul, Martin H. Peery, XiaoHua sam Qiu, Mark A. Rickard, Steven Rosenberg, Ian A. Tomlinson, Cheng Li Zu
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Publication number: 20150151255Abstract: A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method includes the step of applying a polyfunctional amine monomer and polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the step of applying the polyfunctional acyl halide monomer to the porous support includes the step of combining the polyfunctional acyl halide monomer with a non-polar solvent at a concentration of at least 0.18 weight percent to form a coating solution which is applied to the surface of the porous support, and wherein the interfacial polymerization is conducted in the presence of a tri-hydrocarbyl phosphate compound which is provided in a molar ratio of at least 0.5:1 with the polyfunctional acyl halide monomer. Many additional embodiments are described including membranes made from the subject method and applications for such membranes.Type: ApplicationFiled: July 3, 2013Publication date: June 4, 2015Applicant: Dow Global Technologies LLCInventors: Abhishek Roy, Tina L. Arrowood, Robert C. Cieslinski, Derek M. Stevens, David D. Hawn, Steven D. Jons, Mou Paul, Martin H. Peery, Steven Rosenberg, Ian A. Tomlinson
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Publication number: 20150129485Abstract: A thin film composite membrane including a porous support and a thin film polyamide layer characterized by having a dissociated carboxylate content of at least 0.45 moles/kg at pH 9.5 and a method for making a composite polyamide applying a polar solution comprising a polyfunctional amine monomer and a non-polar solution comprising a polyfunctional amine-reactive monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by the non-polar solution comprising at least 0.025 wt % of an acid compound including at least one carboxylic acid moiety and at least one amine-reactive moiety selected from acyl halide and anhydride.Type: ApplicationFiled: July 3, 2013Publication date: May 14, 2015Applicants: DOW GLOBAL TECHNOLOGIES LLC, DOW GLOBAL TECHNOLOGIES LLC, THE DOW CHEMICAL COMPANYInventors: Abhishek Roy, Tina L. Arrowood, Robert C. Cieslinski, David D. Hawn, Steven D. Jons, Mou Paul, Martin H. Peery, XiaoHua Qiu, Steven Rosenberg, Ian A. Tomlinson, Chengli Zu
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Patent number: 4330298Abstract: Method for determining total organic sulfur using reductive pyrolysis and specific electrochemical detection of sulfide ion at a mercury electrode. The method is especially useful for the determination of sulfur in matrices containing halogen or nitrogen compounds. Under routine conditions, a detection limit of less than 50 parts per billion (ppb) can be achieved using differential pulse cathodic stripping voltammetry as the detection mode.Type: GrantFiled: September 30, 1980Date of Patent: May 18, 1982Assignee: The Dow Chemical CompanyInventors: David D. Hawn, Robert E. Reim