Patents by Inventor Warren Francis Knoff
Warren Francis Knoff 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: 9790622Abstract: The present invention concerns methods for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising 5-(6)-amino-2-(p-aminophenyl)benzimidazole, an aromatic para-diamine, and an aromatic para-diacid; the method comprising: a) spinning said copolymer from an inorganic acid solvent to produce the aramid yarn; b) washing said yarn with a basic aqueous solution for at least 5 seconds; and c) heating said yarn; wherein the yarn is heated in at least two process steps, characterized in that (i) in a first step the yarn is heated at a temperature of 200 to 360° C. at a tension of at least 0.2 cN/dtex, followed by (ii) a second step wherein the yarn is heated at a temperature of 370 to 500° C. at a tension of less than 1 cN/dtex. In some embodiments, the yarn has an effective polymer cation to sulfur content molar ratio of at least 0.3. In some embodiments, the yarn has a hydrolytic strength retention of the yarn is greater than 60%.Type: GrantFiled: September 30, 2016Date of Patent: October 17, 2017Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Warren Francis Knoff, Christopher William Newton
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Publication number: 20170016145Abstract: The present invention concerns methods for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising 5-(6)-amino-2-(p-aminophenyl)benzimidazole, an aromatic para-diamine, and an aromatic para-diacid; the method comprising: a) spinning said copolymer from an inorganic acid solvent to produce the aramid yarn; b) washing said yarn with a basic aqueous solution for at least 5 seconds; and c) heating said yarn; wherein the yarn is heated in at least two process steps, characterized in that (i) in a first step the yarn is heated at a temperature of 200 to 360° C. at a tension of at least 0.2 cN/dtex, followed by (ii) a second step wherein the yarn is heated at a temperature of 370 to 500° C. at a tension of less than 1 cN/dtex. In some embodiments, the yarn has an effective polymer cation to sulfur content molar ratio of at least 0.3.Type: ApplicationFiled: September 30, 2016Publication date: January 19, 2017Inventors: Warren Francis Knoff, CHRISTOPHER WILLIAM NEWTON
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Patent number: 9481946Abstract: The present invention concerns methods for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising 5-(6)-amino-2-(p-aminophenyl)benzimidazole, an aromatic para-diamine, and an aromatic para-diacid. The method comprises: a) spinning said copolymer from an inorganic acid solvent to produce the aramid yarn; b) washing the yarn with a basic aqueous solution for at least 5 seconds; and c) heating the yarn; wherein the yarn is heated in at least two process steps, comprising (i) in a first step the yarn is heated at a temperature of 200 to 360° C. at a tension of at least 0.2 cN/dtex, followed by (ii) a second step wherein the yarn is heated at a temperature of 370 to 500° C. at a tension of less than 1 cN/dtex.Type: GrantFiled: January 13, 2012Date of Patent: November 1, 2016Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Warren Francis Knoff, Christopher William Newton
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Patent number: 9434142Abstract: A method of making a composite sandwich panel comprises the steps of (i) making a core structure, (ii) making at least one facesheet, (iii) bonding at least one of the at least one facesheets to the core structure, wherein the growth of a carbon nanotube structure is achieved during at least one of steps (i) to (iii).Type: GrantFiled: January 25, 2013Date of Patent: September 6, 2016Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Mikhail R Levit, Llewellyn Bentley Richardson, III, Warren Francis Knoff, Dariusz Wlodzimierz Kawka
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Patent number: 9365952Abstract: The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15. The yarns have a sulfur content greater than 0.1%; and have an effective polymer cation to sulfur content molar ratio of at least 0.3. Additional aspects of the invention concern methods of producing such yarns.Type: GrantFiled: January 13, 2012Date of Patent: June 14, 2016Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Warren Francis Knoff, Christopher William Newton
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Publication number: 20150367608Abstract: A multilayer laminate comprising in order, a polymeric film layer capable of withstanding a temperature of at least 200 C for at least 10 min, an adhesive layer having an areal weight of from 2 to 40 gsm capable of activation at a temperature of from 75 to 200 degrees C. and an inorganic refractory layer wherein the refractory layer comprises platelets in an amount at least 85% by weight with a dry areal weight of 15 to 50 gsm and has a residual moisture content of no greater than 10 percent by weight.Type: ApplicationFiled: August 27, 2015Publication date: December 24, 2015Inventors: LLEWELLYN BENTLEY RICHARDSON, III, WARREN FRANCIS KNOFF, JIAN WANG
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Publication number: 20150353184Abstract: A multilayer laminate for use as a flame barrier in an aircraft comprising (i) a polymeric film layer capable of withstanding a temperature of at least 200 C for at least 10 min, (ii) an adhesive layer having an areal weight of from 2 to 40 gsm capable of activation at a temperature of from 75 to 200 degrees C., (iii) an inorganic refractory layer, and (iv) aramid paper comprising from 50 to 90 weight percent of aramid fibers and from 10 to 50 weight percent of meta-aramid binder wherein the inorganic refractory layer of (iii) comprises platelets in an amount of at least 85% by weight with a dry areal weight of 15 to 50 gsm and a residual moisture content of no greater than 10 percent by weight.Type: ApplicationFiled: May 6, 2015Publication date: December 10, 2015Inventors: LLEWELLYN BENTLEY RICHARDSON, III, WARREN FRANCIS KNOFF, JIAN WANG
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Patent number: 8957183Abstract: The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.Type: GrantFiled: January 13, 2012Date of Patent: February 17, 2015Assignee: E I du Pont de Nemours and CompanyInventors: Warren Francis Knoff, Christopher William Newton
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Publication number: 20140256204Abstract: Carbon nanotubes are coupled and aligned in a non-woven sheet as measured by failure strain by drawing the sheet with a coupling agent such as triphenylmethane and preferable a liquid diluent such as chlorosulfonic acid or sulfuric acid. The formed non-woven sheet has a full width at half maximum as determined by wide angle X-ray diffraction of not greater than 20°.Type: ApplicationFiled: February 21, 2014Publication date: September 11, 2014Applicant: E I DU Pont De Nemours And CompanyInventor: WARREN FRANCIS KNOFF
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Publication number: 20130196175Abstract: A method of making a composite sandwich panel comprises the steps of (i) making a core structure, (ii) making at least one facesheet, (iii) bonding at least one of the at least one facesheets to the core structure, wherein the growth of a carbon nanotube structure is achieved during at least one of steps (i) to (iii).Type: ApplicationFiled: January 25, 2013Publication date: August 1, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Mikhail R. LEVIT, Llewellyn Bentley RICHARDSON, III, Warren Francis KNOFF, Dariusz Wlodzimierz KAWKA
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Publication number: 20130075950Abstract: The present invention concerns methods for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising 5-(6)-amino-2-(p-aminophenyl)benzimidazole, an aromatic para-diamine, and an aromatic para-diacid. The method comprises: a) spinning said copolymer from an inorganic acid solvent to produce the aramid yarn; b) washing the yarn with a basic aqueous solution for at least 5 seconds; and c) heating the yarn; wherein the yarn is heated in at least two process steps, comprising (i) in a first step the yarn is heated at a temperature of 200 to 360° C. at a tension of at least 0.2 cN/dtex, followed by (ii) a second step wherein the yarn is heated at a temperature of 370 to 500° C. at a tension of less than 1 cN/dtex.Type: ApplicationFiled: January 13, 2012Publication date: March 28, 2013Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: WARREN FRANCIS KNOFF, CHRISTOPHER WILLIAM NEWTON
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Patent number: 8387748Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.Type: GrantFiled: August 28, 2012Date of Patent: March 5, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Llewellyn Bentley Richardson, III, Jian Wang, Warren Francis Knoff
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Publication number: 20130014329Abstract: The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15. The yarns have a sulfur content greater than 0.1%; and have an effective polymer cation to sulfur content molar ratio of at least 0.3. Additional aspects of the invention concern methods of producing such yarns.Type: ApplicationFiled: January 13, 2012Publication date: January 17, 2013Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: WARREN FRANCIS KNOFF, Christopher William Newton
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Publication number: 20130018148Abstract: The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.Type: ApplicationFiled: January 13, 2012Publication date: January 17, 2013Applicant: E. I . DU PONT DE NEMOURS AND COMPANYInventors: WARREN FRANCIS KNOFF, CHRISTOPHER WILLIAM NEWTON
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Publication number: 20120321868Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.Type: ApplicationFiled: August 28, 2012Publication date: December 20, 2012Applicant: E I Du Pont De Nemours and CompanyInventors: Llewellyn Bentley Richardson, III, Jian Wang, Warren Francis Knoff
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Patent number: 8292027Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.Type: GrantFiled: April 14, 2010Date of Patent: October 23, 2012Assignee: E I du Pont de Nemours and CompanyInventors: Llewellyn Bentley Richardson, III, Warren Francis Knoff, Jian Wang
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Publication number: 20110094826Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.Type: ApplicationFiled: April 14, 2010Publication date: April 28, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Llewellyn Bentley Richardson, III, Warren Francis Knoff, Jian Wang
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Publication number: 20090158683Abstract: A multiple sheet building wrap for wrapping the structural components of a building in order to protect the underlying structural components and optional building sheathing from moisture is provided. The building wrap is particularly useful under facades such as wet applied stucco or engineered stone, demonstrating good drainage of liquid water and moisture vapor permeability. The building wrap is a composite of a water resistive barrier, a three-dimensional mesh layer and a porous intervening layer which acts to filter the stucco as it is applied. An exterior wall construction incorporating such building wrap is also provided.Type: ApplicationFiled: December 20, 2007Publication date: June 25, 2009Inventors: Theresa Ann Weston, Barbara Klimowicz O'Rourke, Mieczyslaw (Michel) Stachnik, Warren Francis Knoff, Wazir Nobbee, Kimdolyn Boone
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Patent number: RE46658Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.Type: GrantFiled: October 15, 2014Date of Patent: January 2, 2018Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Llewellyn Bentley Richardson, III, Warren Francis Knoff, Jian Wang
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Patent number: RE46859Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.Type: GrantFiled: October 15, 2014Date of Patent: May 22, 2018Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Llewellyn Bentley Richardson, III, Warren Francis Knoff, Jian Wang