Patents by Inventor Andrew P. Chafin
Andrew P. Chafin 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: 11898082Abstract: This invention describes resins with phosphate cores and a simple, three-step process for their synthesis. Preferred resins are cyanate ester resins with bridging phosphate groups. These resins can be cured to produce thermoset polymers having Tgs of between 131 and >360° C. depending on the number of cyanate ester groups per phosphate and the substitution pattern of the aromatic rings. The high char yields of these resins, up to about 67%, coupled with the phosphate core means that these materials will have applications as fire-resistant polymers. Additionally, these materials can potentially be blended with conventional cyanate esters or other compatible thermosetting resins to improve the fire resistance of composite materials. Other applications may include use in fire-resistant circuit boards, or as surface coatings to reduce flammability of conventional composite materials or thermoplastics.Type: GrantFiled: October 7, 2020Date of Patent: February 13, 2024Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Benjamin G. Harvey, Andrew P. Chafin, Michael D. Garrison
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Patent number: 10913898Abstract: This invention describes resins with phosphate cores and a simple, three-step process for their synthesis. Preferred resins are cyanate ester resins with bridging phosphate groups. These resins can be cured to produce thermoset polymers having Tgs of between 131 and >360° C. depending on the number of cyanate ester groups per phosphate and the substitution pattern of the aromatic rings. The high char yields of these resins, up to about 67%, coupled with the phosphate core means that these materials will have applications as fire-resistant polymers. Additionally, these materials can potentially be blended with conventional cyanate esters or other compatible thermosetting resins to improve the fire resistance of composite materials. Other applications may include use in fire-resistant circuit boards, or as surface coatings to reduce flammability of conventional composite materials or thermoplastics.Type: GrantFiled: November 1, 2018Date of Patent: February 9, 2021Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Benjamin G. Harvey, Andrew P. Chafin, Michael D. Garrison
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Patent number: 10155906Abstract: This invention describes resins with phosphate cores and a simple, three-step process for their synthesis. Preferred resins are cyanate ester resins with bridging phosphate groups. These resins can be cured to produce thermoset polymers having Tgs of between 131 and >360° C. depending on the number of cyanate ester groups per phosphate and the substitution pattern of the aromatic rings. The high char yields of these resins, up to about 67%, coupled with the phosphate core means that these materials will have applications as fire-resistant polymers. Additionally, these materials can potentially be blended with conventional cyanate esters or other compatible thermosetting resins to improve the fire resistance of composite materials. Other applications may include use in fire-resistant circuit boards, or as surface coatings to reduce flammability of conventional composite materials or thermoplastics.Type: GrantFiled: September 6, 2016Date of Patent: December 18, 2018Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Benjamin G. Harvey, Andrew P. Chafin, Michael D. Garrison
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Patent number: 10000643Abstract: The present invention provides a pigment/additive comprising discrete multivalent oxidation state (DiMVO) phenothiazine compounds having corrosion inhibiting properties. These novel DiMVO phenothiazines are useful in preparing waterborne primer coating formulations for application to metals and metal alloys and demonstrating corrosion inhibiting properties. Furthermore, such formulations are chromate-free and have reduced VOC content. Methods of preparing and using such compounds and waterborne formulations also are described.Type: GrantFiled: December 3, 2015Date of Patent: June 19, 2018Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Joseph W. Tsang, Michael E. Wright, Andrew P. Chafin
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Patent number: 9458329Abstract: A composition and method of preparing and adding unique organic additives to a metal-free coating system followed by application then provides long term corrosion protection to a reactive metal surface.Type: GrantFiled: February 4, 2014Date of Patent: October 4, 2016Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Michael E. Wright, Andrew P. Chafin, Joseph W. Tsang
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Patent number: 9058915Abstract: A new class of polymers based upon the radialene group as the parent repeating group and characterized by the following general formula: where R1, R2, R3, R4 are each independently any pi electron conjugated group, but not limited to: pyrrole, thiophene, benzene, naphthalene, furan, ethene, aniline, and n is an integer from 2 to 20,000. Furthermore, the individual R groups can be further functionalized with an alky group having 1 to 22 carbons; alkoxy group having 1 to 22 carbons; alkyl sulfonate having 1 to 22 carbons; alkyl phosphate group containing 1 to 22 carbons, alkoxy phosphate group having 1 to 22 carbons; ethenylendioxy group; propylene dioxy group.Type: GrantFiled: April 15, 2013Date of Patent: June 16, 2015Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Peter Zarras, Alfred Baca, John D. Stenger-Smith, Andrew P. Chafin, William Lai
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Patent number: 8574467Abstract: A benzo-fused-heterocyclic elongated dye having a superior molecular hyperpolarizability and yet having an acceptably-low optical absorbance of light near 1550 nm in wavelength, which is an important optical communication band for telecommunication applications.Type: GrantFiled: July 23, 2012Date of Patent: November 5, 2013Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Matthew C. Davis, Andrew P. Chafin, William Lai, Geoffrey A. Lindsay
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Patent number: 8574468Abstract: A benzo-fused-heterocyclic elongated dye having a superior molecular hyperpolarizability and yet having an acceptably-low optical absorbance of light near 1550 nm in wavelength, which is an important optical communication band for telecommunication applications.Type: GrantFiled: July 24, 2012Date of Patent: November 5, 2013Assignee: The United States of America as Represented by the Secretary of the NavyInventors: Matthew C. Davis, Andrew P. Chafin, Geoffrey A. Lindsay
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Patent number: 7578859Abstract: A supercapacitor comprising a poly(3,4-ethylendioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT) as electrode couples for the capacitor and a pair of gel electrolyte layers disposed between the electrodes. The gel electrolytes are separated by a battery paper and are selected from a group consisting of a lithium salt and an organic electrolyte.Type: GrantFiled: June 22, 2005Date of Patent: August 25, 2009Assignee: The United States of America as represented by the Secretary of the NavyInventors: John R. Reynolds, Kyukwan Zong, John D. Stenger-Smith, Nicole Anderson, Cynthia K. Webber, Andrew P. Chafin
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Patent number: 6965509Abstract: A supercapacitor comprising a poly(3,4-ethylendioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT) as electrode couples for the capacitor and a pair of gel electrolyte layers disposed between the electrodes. The gel electrolytes are separated by a battery paper and are selected from a group consisting of a lithium salt and an organic electrolyte.Type: GrantFiled: December 2, 2002Date of Patent: November 15, 2005Assignee: The United States of America as represented by the Secretary of the NavyInventors: John R. Reynolds, Kyukwan Zong, John D. Stenger-Smith, Nicole Anderson, Cynthia K. Webber, Andrew P. Chafin
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Patent number: 6861497Abstract: A polyimide is disclosed of the formula: CG1 and CG2 are independently electron-accepting and/or electron-donating groups; x is an integer from about 3 to about 3000; ODAH is any of a number of known dianhydride residues; ODAM is any of a number of known diamine residues; and m, n, o, and p cumulatively add to 1.0, with the sum of m and n ranging from about 0.05 to about 1.0, the sum of o and p ranging from about 0 to about 0.95, the sum of m and o being about 0.5 and the sum of n and p being about 0.5. In addition, a film structure comprising the polyimide and devices utilizing the film structure are disclosed.Type: GrantFiled: October 28, 2002Date of Patent: March 1, 2005Assignee: The United States of America as represented by the Secretary of the NavyInventors: Geoffrey A. Lindsay, Richard A. Hollins, Peter Zaras, Andrew J. Guenthner, Andrew P. Chafin, Mathew C. Davis, Stephen Fallis
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Publication number: 20040106041Abstract: A supercapacitor comprising a poly(3,4-ethylendioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT) as electrode couples for the capacitor and a pair of gel electrolyte layers disposed between the electrodes. The gel electrolytes are separated by a battery paper and are selected from a group consisting of a lithium salt and an organic electrolyte.Type: ApplicationFiled: December 2, 2002Publication date: June 3, 2004Inventors: John R. Reynolds, Kyukwan Zong, John D. Stenger-Smith, Nicole Anderson, Cynthia K. Webber, Andrew P. Chafin
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Publication number: 20030105270Abstract: A polyimide is disclosed of the formula: 1Type: ApplicationFiled: October 28, 2002Publication date: June 5, 2003Inventors: Geoffrey A. Lindsay, Richard A. Hollins, Peter Zarras, Andrew J. Guenthner, Andrew P. Chafin, Mathew C. Davis, Stephen Fallis
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Publication number: 20030097003Abstract: An electron accepting monomer having the formula: 1Type: ApplicationFiled: October 28, 2002Publication date: May 22, 2003Inventors: Geoffrey A. Lindsay, Richard A. Hollins, Mathew C. Davis, Andrew P. Chafin
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Patent number: 6389215Abstract: An optical waveguide subsystem, and process, having at least one cladding in contact with at least one core. The cladding has a refractive index less than the refractive index of the core. Either the cladding or core contains a crosslinked polyimide that is substantially meta-linked. The polyimide has an absolute birefringence of from about 0.01 to about zero.Type: GrantFiled: October 28, 1999Date of Patent: May 14, 2002Assignee: The United States of America as represented by the Secretary of the NavyInventors: Geoffrey A. Lindsay, Andrew P. Chafin, Rena Yee, Peter Zarras
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Patent number: 6114031Abstract: This invention is comprised of new nonlinear optic polymers and a new Lanir-Blodgett (LB) film deposition scheme for which these polymers were designed. The invention is unique because it produces an electro-optic film which has never undergone electric-field poling nor high temperature treatment. It eliminates the dilution effect of the long hydrophobic alkyl groups, and creates stronger ionic bonds between the polymer chains. Finally, the invention reduces the time to make a film of a given thickness by at least half by virtue of depositing two polymer layers per stroke. The new polymers are comprised of asymmetric chromophores linked head-to-head by alternating two different kinds of bridging groups. One of the bridging groups contains one or more ionic groups, and the other bridging group contains one or more non-ionic, hydrophilic groups.Type: GrantFiled: January 11, 1999Date of Patent: September 5, 2000Assignee: The United States of America as represented by the Secretary of the NavyInventors: Marion J. Roberts, John D. Stenger-Smith, Kenneth J. Wynne, Peter Zarras, Andrew P. Chafin, Richard A. Hollins, Geoffrey A. Lindsay
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Patent number: 5904990Abstract: Until recently, conducting polymers have been used as protective coatings. lthough these types of polymers appear to be effective in most cases, problems have resulted when attempting to bind these polymers to an aluminum surface. The polymers of this invention adhere extremely well to aluminum and aluminum alloys and thus, provide a very effective form of corrosion protection.Type: GrantFiled: March 13, 1998Date of Patent: May 18, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventors: John D. Stenger-Smith, Melvin H. Miles, William P. Norris, John Nelson, Peter Zarras, John W. Fischer, Andrew P. Chafin
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Patent number: 5882785Abstract: This invention is comprised of new nonlinear optic polymers and a new Lanir-Blodgett (LB) film deposition scheme for which these polymers were designed. The invention is unique because it produces an electro-optic film which has never undergone electric-field poling nor high temperature treatment. It eliminates the dilution effect of the long hydrophobic alkyl groups, and creates stronger ionic bonds between the polymer chains. Finally, the invention reduces the time to make a film of a given thickness by at least half by virtue of depositing two polymer layers per stroke. The new polymers are comprised of asymmetric chromophores linked head-to-head by alternating two different kinds of bridging groups. One of the bridging groups contains one or more ionic groups, and the other bridging group contains one or more non-ionic, hydrophilic groups.Type: GrantFiled: January 23, 1997Date of Patent: March 16, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard A. Hollins, Geoffrey A. Lindsay, Marion J. Roberts, Peter Zarras, John D. Stenger-Smith, Kenneth J. Wynne, Andrew P. Chafin
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Patent number: 5604292Abstract: Novel conjugated amino substituted phenylene polymers are disclosed having on-linear optical properties, and which can be converted to electrically conductive polymers. Such polymers are produced by reacting a novel bis-cycloalkylene sulfonium salt of 2,5,N,N-tetramethylaniline hydrochloride, such as 2,5-(N,N-dimethyl)aniline hydrochloride dimethylene bis-(tetramethylene sulfonium chloride) with alkali metal hydroxide to form a cycloalkylene sulfonium salt precursor polymer, and then heating the precursor polymer under conditions to produce the amino substituted phenylene vinylene polymer, such as poly(2-(N,N-dimethylamino) phenylene vinylene). The polymers can also be made directly by treatment of the bis chlormethyl dimethyl aniline hydrochloride derivative with alkali metal alkoxide.Type: GrantFiled: May 31, 1994Date of Patent: February 18, 1997Assignee: The Untied States of America as represented by the Secretary of the NavyInventors: John D. Stenger-Smith, William P. Norris, Andrew P. Chafin, Scott T. Sackinger
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Patent number: H2046Abstract: A process that lends itself to automation for producing multi-layer second-order nonlinear optical polymer (NLOP) thin films by the forming of a polycation layer containing an NLO-active cationic polymer, having non-centrosymmetric chromophores, on a substrate followed by the forming of a polyanion layer, also having non-centrosymmetric chromophores, on the polycation layer. A predetermind number of the polycation and the polyanion layers may be alternated upon the surface as well as one or more buffer layers. An added benefit is the formation of an ultra-smooth surface of the same order of roughness as the substrate upon which the layers are formed.Type: GrantFiled: October 22, 1997Date of Patent: September 3, 2002Assignee: The United States of America as represented by the Seceretary of the NavyInventors: M. Joe Roberts, Geoff A. Lindsay, Kenneth J. Wynne, Andrew P. Chafin, John D. Stenger-Smith, Peter Zarras, Rena Y. Yee, Richard A. Holloins