Patents by Inventor Henry M. Hodgens
Henry M. Hodgens 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: 8236190Abstract: A method of removing recast from a substrate is disclosed. The method includes chemically removing the recast using an etchant, which provides a visual indication of the presence of the recast when the part has been removed from the etchant. One example chemical etchant is comprised of a sulfuric acid solution that includes sodium chloride, sodium fluoride and ammonium persulfate. After chemical removal of the recast from the substrate, the recast is physically removed from the substrate, for example, by media blasting. The chemical and physical recast removal process can be repeated as desired. To ensure that all the recast has been removed, the substrate is wiped, for example, using a cloth. If all the recast has been removed, the cloth will not change in appearance or color.Type: GrantFiled: June 13, 2008Date of Patent: August 7, 2012Assignee: United Technologies CorporationInventors: Michael J. Gehron, Henry M. Hodgens
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Publication number: 20090308761Abstract: A method of removing recast from a substrate is disclosed. The method includes chemically removing the recast using an etchant, which provides a visual indication of the presence of the recast when the part has been removed from the etchant. One example chemical etchant is comprised of a sulfuric acid solution that includes sodium chloride, sodium fluoride and ammonium persulfate. After chemical removal of the recast from the substrate, the recast is physically removed from the substrate, for example, by media blasting. The chemical and physical recast removal process can be repeated as desired. To ensure that all the recast has been removed, the substrate is wiped, for example, using a cloth. If all the recast has been removed, the cloth will not change in appearance or color.Type: ApplicationFiled: June 13, 2008Publication date: December 17, 2009Inventors: Michael J. Gehron, Henry M. Hodgens
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Patent number: 6869690Abstract: The present invention relates to a zinc-diffused nickel alloy coating for corrosion and heat protection and to a method for forming such a coating. The coating method broadly comprises the steps of forming a plain nickel or nickel alloy coating layer on a substrate, applying a layer of zinc over the nickel or nickel alloy coating layer, and thermally diffusing the zinc into the nickel alloy coating layer. The coating method may further comprise immersing the coated substrate in a phosphated trivalent chromium conversion solution either before or after the diffusing step. The substrate may be a component used in a gas turbine engine, which component is formed from a steel material.Type: GrantFiled: May 19, 2004Date of Patent: March 22, 2005Assignee: United Technologies CorporationInventors: Henry M. Hodgens, Thomas R. Hanlon
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Patent number: 6793838Abstract: The present invention relates to a chemical milling solution and a chemical milling process for removing a desired depth of material from metal parts. The milling solution contains nitric acid, hydrofluoric acid, a wetting agent, such as a surfactant, dissolved titanium, and the balance water. The solution is maintained at a temperature in the range of from about 110° F. to about 130° F. The metal part to be milled is immersed in the milling solution for a time sufficient to remove a desired depth of material from at least one surface of the part.Type: GrantFiled: September 28, 2001Date of Patent: September 21, 2004Assignee: United Technologies CorporationInventors: James O. Hansen, Kenneth C. Long, Michael A. Jackson, Henry M. Hodgens
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Patent number: 6756134Abstract: The present invention relates to a zinc-diffused nickel alloy coating for corrosion and heat protection and to a method for forming such a coating. The coating method broadly comprises the steps of forming a plain nickel or nickel alloy coating layer on a substrate, applying a layer of zinc over the nickel or nickel alloy coating layer, and thermally diffusing the zinc into the nickel alloy coating layer. The coating method may further comprise immersing the coated substrate in a phosphated trivalent chromium conversion solution either before or after the diffusing step. The substrate may be a component used in a gas turbine engine, which component is formed from a steel material.Type: GrantFiled: September 23, 2002Date of Patent: June 29, 2004Assignee: United Technologies CorporationInventors: Henry M. Hodgens, Thomas R. Hanlon, Promila Bhatia
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Publication number: 20040058189Abstract: The present invention relates to a zinc-diffused nickel alloy coating for corrosion and heat protection and to a method for forming such a coating. The coating method broadly comprises the steps of forming a plain nickel or nickel alloy coating layer on a substrate, applying a layer of zinc over the nickel or nickel alloy coating layer, and thermally diffusing the zinc into the nickel alloy coating layer. The coating method may further comprise immersing the coated substrate in a phosphated trivalent chromium conversion solution either before or after the diffusing step. The substrate may be a component used in a gas turbine engine, which component is formed from a steel material.Type: ApplicationFiled: September 23, 2002Publication date: March 25, 2004Inventors: Henry M. Hodgens, Thomas R. Hanlon
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Publication number: 20030066818Abstract: The present invention relates to a chemical milling solution and a chemical milling process for removing a desired depth of material from metal parts. The milling solution contains nitric acid, hydrofluoric acid, a wetting agent, such as a surfactant, dissolved titanium, and the balance water. The solution is maintained at a temperature in the range of from about 110° F. to about 130° F. The metal part to be milled is immersed in the milling solution for a time sufficient to remove a desired depth of material from at least one surface of the part.Type: ApplicationFiled: September 28, 2001Publication date: April 10, 2003Inventors: James O. Hansen, Kenneth C. Long, Michael A. Jackson, Henry M. Hodgens
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Patent number: 5451299Abstract: The invention provides method and apparatus for chemical milling of a metal part in a milling solution that reduces hydrogen absorption by the part wherein, the metal part to be milled, which serves as the anode, and a cathode of more noble metal than the anode, are mounted in such solution. Unlike the prior art, the cathode and anode are separated in such solution but electrically connected by a conductor therebetween, which conductor is insulated from the milling solution. Thus anode and cathode are mounted, spaced apart in the milling solution, so that metal dissolves from the anode surface, milling such part while electrons flow from anode to cathode by said conductor so that hydrogen forms at the cathode, removed from the anode part, to reduce hydrogen absorption by such part.The anode part can be of, eg. titanium and the cathode of a more noble metal, eg. platinum, which serves to draw the hydrogen to the cathode and away from the anode part, preventing or reducing absorption of hydrogen into, eg.Type: GrantFiled: December 23, 1992Date of Patent: September 19, 1995Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Hugh M. Privett, III, Henry M. Hodgens, II
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Patent number: 5217569Abstract: A solution is described for the chemical processing of beta phase-containing titanium alloys. The solution contains HNO.sub.3 and HF, along with a small but effective amount of copper, ruthenium, rhodium, palladium, osmium, iridium, platinum or gold to reduce hydrogen absorption, ammonium formate and citric acid to increase the milling rate, and a surfactant to ensure a satisfactory milled surface.Type: GrantFiled: December 31, 1991Date of Patent: June 8, 1993Assignee: United Technologies CorporationInventors: Henry M. Hodgens, II, Kenneth C. Long, Robert E. Fishter
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Patent number: 5201997Abstract: A solution is described for the chemical milling of niobium and niobium-base alloys. The solution contains about 25% HNO.sub.3, about 19% HF, balance H.sub.2 O, with additions of citric acid and ammonium formate to control the reaction rate and provide a smooth surface finish without intergranular attack, and a small amount of a noble metal to control hydrogen absorption. A process for using the solution to mill niobium alloys is also described.Type: GrantFiled: December 31, 1991Date of Patent: April 13, 1993Assignee: United Technologies CorporationInventors: Robert E. Fishter, Kenneth C. Long, Henry M. Hodgens, II
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Patent number: 5017410Abstract: Electroless plating compositions are described which produce a boron containing nickel coating. The compositions comprise a water soluble nickel salt, a chelating agent, an alkali metal hydroxide, a boron containing reducing agent, and thiocarbanilide. The composition is particularly useful for providing such coatings on gas turbine engine parts and results in improved wear resistance.Type: GrantFiled: May 23, 1988Date of Patent: May 21, 1991Assignee: United Technologies CorporationInventor: Henry M. Hodgens, II
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Patent number: 4983428Abstract: Electroless plating compositions are described which produce a boron containing nickel coating. The compositions comprise a water soluble nickel salt, a chelating agent, an alkali metal hydroxide, a boron containing reducing agent, and ethylenethiourea. The composition is particularly useful for providing such coatings on gas turbine engine parts and results in improved wear resistance.Type: GrantFiled: June 9, 1988Date of Patent: January 8, 1991Assignee: United Technologies CorporationInventor: Henry M. Hodgens, II
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Patent number: 4834912Abstract: A composition and method for removing deposits (10) from the internal components (24) of a gas turbine engine (18) utilizing a cleaning composition (15) which comprises an aqueous solution of hydroxylamine sulfate, a chelating agent, a compound selected from the group consisting of ammonium sulfamate, ammonium sulfamide, and hydroxylamine-o-sulfonic acid, and, an alkaline pH modifying substance added in an amount sufficient to achieve a pH value of between 6.5 and 14. The method involves contacting the deposits with the cleaning composition, such as in an apply and soak type pattern, chemically dislodging the deposits from the component surfaces. The engine is rinsed to remove the dislodged deposits and residual cleaning composition.Type: GrantFiled: August 3, 1987Date of Patent: May 30, 1989Assignee: United Technologies CorporationInventors: Henry M. Hodgens, II, William A. Cellich
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Patent number: 4713120Abstract: A composition and method for removing deposits (10) from the internal components (24) of a gas turbine engine (18) utilizing a cleaning composition (15) which comprises an aqueous solution of hydroxylamine sulfate, a chelating agent, a compound selected from the group consisting of ammonium sulfamate, ammonium sulfamide, and hydroxylamine-o-sulfonic acid, and, an alkaline pH modifying substance added in an amount sufficient to achieve a pH value of between 6.5 and 14. The method involves contacting the deposits with the cleaning composition, such as in an apply and soak type pattern, chemically dislodging the deposits from the component surfaces. The engine is rinsed to remove the dislodged deposits and residual cleaning composition.Type: GrantFiled: February 13, 1986Date of Patent: December 15, 1987Assignee: United Technologies CorporationInventors: Henry M. Hodgens, II, William A. Cellich