Patents by Inventor Mohammad Ehteshami
Mohammad Ehteshami 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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Publication number: 20110023288Abstract: Rotor and stator assemblies that utilize magnetic bearings for supporting the rotor shaft during operation can be suitably used in corrosive environments, such as sour gas. The rotor and stator assemblies include NACE compliant magnetic bearing arrangements for sour gas applications. One embodiment includes a stator assembly that comprises a stator sleeve formed of a magnetic material, a sleeve extender coaxial to the stator sleeve formed of a non-magnetic material fixedly attached to each end of the stator sleeve, wherein a point of attachment is heat treated, and a wall formed of the non-magnetic material fixedly attached to the sleeve extender configured to hermetically house a stator and form the encapsulated stator assembly.Type: ApplicationFiled: October 14, 2010Publication date: February 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Konrad Roman Weeber, Mohamed Ahmed Ali, Mohammad Ehteshami, Ravindra Gadangi, Ramgopal Thodla, Jeremy Daniel Van Dam
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Patent number: 7847454Abstract: Rotor and stator assemblies that utilize magnetic bearings for supporting the rotor shaft during operation can be suitably used in corrosive environments, such as sour gas. The rotor and stator assemblies include NACE compliant magnetic bearing arrangements for sour gas applications. One embodiment includes a stator assembly that comprises a stator sleeve formed of a magnetic material, a sleeve extender coaxial to the stator sleeve formed of a non-magnetic material fixedly attached to each end of the stator sleeve, wherein a point of attachment is heat treated, and a wall formed of the non-magnetic material fixedly attached to the sleeve extender configured to hermetically house a stator and form the encapsulated stator assembly.Type: GrantFiled: November 2, 2007Date of Patent: December 7, 2010Assignee: General Electric CompanyInventors: Konrad Roman Weeber, Mohamed Ahmed Ali, Mohammad Ehteshami, Ravindra Gadangi, Ramgopal Thodla, Jeremy Daniel Van Dam
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Publication number: 20090113999Abstract: Test methods for testing rotor and stator assemblies that utilize magnetic bearings prior to installation. The test method generally includes operating the rotor and stator assembly prior to installation in a test atmosphere at a pressure greater than 2 bar. The test atmosphere can be formed of air, an inert gas, or an expanded cryogenic gas.Type: ApplicationFiled: November 2, 2007Publication date: May 7, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: William Dwight Gerstler, Mohamed Ahmed Ali, Bruce William Brisson, Mohammad Ehteshami, Ravindra Gadangi, Konrad Roman Weeber
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Publication number: 20080218015Abstract: Rotor and stator assemblies that utilize magnetic bearings for supporting the rotor shaft during operation can be suitably used in corrosive environments, such as sour gas. The rotor and stator assemblies include NACE compliant magnetic bearing arrangements for sour gas applications. One embodiment includes a stator assembly that comprises a stator sleeve formed of a magnetic material, a sleeve extender coaxial to the stator sleeve formed of a non-magnetic material fixedly attached to each end of the stator sleeve, wherein a point of attachment is heat treated, and a wall formed of the non-magnetic material fixedly attached to the sleeve extender configured to hermetically house a stator and form the encapsulated stator assembly.Type: ApplicationFiled: November 2, 2007Publication date: September 11, 2008Applicant: GENERAL ELECTRIC COMPANYInventors: Konrad Roman Weeber, Mohamed Ahmed Ali, Mohammad Ehteshami, Ravindra Gadangi, Ramgopal Thodla, Jeremy Daniel Van Dam
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Publication number: 20080219834Abstract: Rotor and stator assemblies that utilize magnetic bearings for supporting the rotor shaft during operation can be suitably used in corrosive environments, such as sour gas. The rotor and stator assemblies include NACE compliant magnetic bearing arrangements for sour gas applications. In one embodiment, a rotor shaft assembly for a magnetic bearing arrangement comprises a rotor shaft formed of a ferromagnetic material comprising a plurality of rotor laminations disposed on the rotor shaft; and a barrier layer formed on selected exposed surfaces of the rotor shaft, wherein the barrier layer is effective to resist corrosion relative to the surface without the barrier layer.Type: ApplicationFiled: November 2, 2007Publication date: September 11, 2008Applicant: GENERAL ELECTRIC COMPANYInventors: Glen David Merfeld, Mohamed Ahmed Ali, Bruce William Brisson, Mohammad Ehteshami, Ravindra Gadangi, William Dwight Gerstler, Eugenio Giorni, Patricia Chapman Irwin, Ramgopal Thodla, Jeremy Daniel Van Dam, Konrad Roman Weeber
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Publication number: 20080218008Abstract: Rotor and stator assemblies that utilize magnetic bearings for supporting the rotor shall during operation can be suitably used in corrosive environments, such as sour gas. The rotor and stator assemblies include NACE compliant magnetic bearing arrangements for sour gas applications. One embodiment includes the use of barrier layers disposed on selected exposed surfaces of the rotor shaft assembly and/or stator assembly. Also disclosed are processes for forming encapsulated stators that exhibit improved corrosion resistance, as well as corrosion resistant materials for backup bearing races and landing sleeves.Type: ApplicationFiled: November 2, 2007Publication date: September 11, 2008Applicant: GENERAL ELECTRIC COMPANYInventors: Farshad Ghasripoor, Mohamed Ahmed Ali, Bruce William Brisson, Mohammad Ehteshami, William Dwight Gerstler, Patricia Chapman Irwin, Vasanth Srinivasa Kothnur, Ramgopal Thodla, Jeremy Daniel Van Dam, Konrad Roman Weeber
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Patent number: 6655146Abstract: A combustor liner has an annular shell which includes a first portion and a second portion. The first portion is provided with slot film cooling and the second portion is provided with multi-hole film cooling. The multi-hole cooling portion can be located either forward or aft of the slot film cooling portion, depending on the nature of the combustor that the liner is to be used in. In one possible embodiment, the liner includes a first annular panel, a second annular panel section joined at its forward end to the aft end of the first panel section, and a third annular panel section being joined at its forward end to the aft end of the second panel section. At least one of the panel sections has multi-hole film cooling and at least one other of the panel sections has slot film cooling.Type: GrantFiled: July 31, 2001Date of Patent: December 2, 2003Assignee: General Electric CompanyInventors: Ella Christine Kutter, Marwan Al-Roub, Thomas Anthony Leen, Daniel Dale Brown, Craig Douglas Young, Gilbert Farmer, Mohammad Ehteshami
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Publication number: 20030027093Abstract: A combustor liner has an annular shell which includes a first portion and a second portion. The first portion is provided with slot film cooling and the second portion is provided with multi-hole film cooling. The multi-hole cooling portion can be located either forward or aft of the slot film cooling portion, depending on the nature of the combustor that the liner is to be used in. In one possible embodiment, the liner includes a first annular panel, a second annular panel section joined at its forward end to the aft end of the first panel section, and a third annular panel section being joined at its forward end to the aft end of the second panel section. At least one of the panel sections has multi-hole film cooling and at least one other of the panel sections has slot film cooling.Type: ApplicationFiled: July 31, 2001Publication date: February 6, 2003Inventors: Ella Christine Kutter, Marwan Al-Roub, Thomas Anthony Leen, Daniel Dale Brown, Craig Douglas Young, Gilbert Farmer, Mohammad Ehteshami
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Patent number: 5197856Abstract: A compressor stator includes an axial centerline axis and has a unitary annular outer case and a plurality of circumferentially spaced outer hooks extending radially inwardly therefrom. A circumferentially segmented inner case is disposed radially inwardly within the outer case and includes a plurality of arcuate inner case segments, each including an arcuate shroud and at least one inner hook extending radially outwardly therefrom, with respective ones of the outer and inner hooks being axially slidably joined to each other for radially supporting an inner surface of the shroud at a common radius.Type: GrantFiled: June 24, 1991Date of Patent: March 30, 1993Assignee: General Electric CompanyInventors: Thomas S. Koertge, Mohammad Ehteshami, Ambrose A. Hauser, James W. Tucker