Patents by Inventor James B. Restorff
James B. Restorff 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: 9490728Abstract: An energy harvesting device for harvesting energy from a moving structure includes a housing allowing transmission of magnetic fields therethrough. A piezoelectric material capable of a phase transition and a magnetostrictive material capable of a structural change when subjected to a magnetic field are mechanically coupled to each other in the housing. An adjustable pre-stress means is positioned between the housing and the combination of the piezoelectric and magnetostrictive materials. Electrical contacts are positioned on the piezoelectric material. A magnet is mounted on the moving structure. The housing is mounted in sufficient proximity to the magnet for the magnetic field of the magnet to induce the structural change in the magnetostrictive material.Type: GrantFiled: November 20, 2014Date of Patent: November 8, 2016Assignee: The United States of America as represented by the Secretary of the NavyInventors: Peter Finkel, Ahmed H Amin, Marilyn Wun-Fogle, James B Restorff, Joseph J Stace, Colin J Murphy
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Patent number: 8308874Abstract: An alloy comprising: a magnetostrictive iron alloy having the formula: FexGayAlz, where x is of from about 65 at % to about 90 at %, y is of from about 5 at % to about 35 at %, and z is of from about 0 at % to about 30 at %; and wherein said alloy has a room temperature magnetostriction of at least approximately 150 ppm. An alloy having a saturated magnetostriction of from about at least 150 ppm comprising: a magnetostrictive iron alloy having the formula: FexGayBet, where x is of from about 65 at % to about 90 at %, y is of from about 1 at % to about 35 at %, and t is of from about 1 at % to about 30 at %; and wherein said alloy has a room temperature magnetostriction of at least approximately 150 ppm.Type: GrantFiled: November 29, 2005Date of Patent: November 13, 2012Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, Marilyn Wun-Fogle, James B. Restorff, Thomas A. Lograsso, Rick Allen Kellogg
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Patent number: 7952239Abstract: Disclosed are bimetallic strips that incorporate magnetostrictive materials to enhance and provide sensing, actuating and energy harvesting functions. The bimetallic strips include a positive magnetostrictive Fe-based alloy layer and a flexible layer. The flexible layer may be a negative magnetostrictive layer or a permanent magnet layer. One or more permanent magnet materials may also be used in the arrangement. The bimetallic strips are inexpensive and easily manufactured, and have characteristics that enhance sensing and actuator applications, and enables energy harvesting.Type: GrantFiled: July 27, 2010Date of Patent: May 31, 2011Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E Clark, Marilyn Wun-Fogle, James B Restorff
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Publication number: 20100291403Abstract: Disclosed are bimetallic strips that incorporate magnetostrictive materials to enhance and provide sensing, actuating and energy harvesting functions. The bimetallic strips include a positive magnetostrictive Fe-based alloy layer and a flexible layer. The flexible layer may be a negative magnetostrictive layer or a permanent magnet layer. One or more permanent magnet materials may also be used in the arrangement. The bimetallic strips are inexpensive and easily manufactured, and have characteristics that enhance sensing and actuator applications, and enables energy harvesting.Type: ApplicationFiled: July 27, 2010Publication date: November 18, 2010Applicant: The United States of America, Secretary of the NavyInventors: Arthur E. Clark, Marilyn Wun-Fogle, James B. Restorff
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Patent number: 7834490Abstract: Disclosed are bimetallic strips that incorporate magnetostrictive materials to enhance and provide sensing, actuating and energy harvesting functions. The bimetallic strips include a positive magnetostrictive Fe-based alloy layer and a flexible layer. The flexible layer may be a negative magnetostrictive layer or a permanent magnet layer. One or more permanent magnet materials may also be used in the arrangement. The bimetallic strips are inexpensive and easily manufactured, and have characteristics that enhance sensing and actuator applications, and enables energy harvesting.Type: GrantFiled: December 19, 2007Date of Patent: November 16, 2010Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, Marilyn Wun-Fogle, James B. Restorff
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Patent number: 7597010Abstract: A method of using a magnetostrictive material to achieve a high magnetomechanical coupling factor comprising building an internal anisotropy energy into the magnetostrictive material and applying a tensile or compressive stress to the magnetostrictive material with the built-in internal anisotropy energy. The internal anisotropy energy is built into the magnetostrictive material by annealing the magnetostrictive material under an annealing stress or a suitable magnetic field. For a positive magnetostrictive material, when the annealing stress is compressive, the stress applied to the annealed material under operation is tensile, and when the annealing stress is the tensile, the stress applied to the annealed material under operation is compressive.Type: GrantFiled: November 15, 2005Date of Patent: October 6, 2009Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, Marilyn Wun-Fogle, James B. Restorff
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Patent number: 7564152Abstract: An elongate structure having a magnetostrictive material composition is subjected to tensile stress in the longitudinal-axial direction, thereby generally orienting the magnetization of the elongate structure in the longitudinal-axial direction. Electrical current is conducted through the elongate structure and/or through at least one adjacent elongate conductor, thereby generally orienting the magnetization of the elongate structure in the transverse direction, generally in parallel with the transverse direction of the magnetic field concomitant the conduction of current through the elongate structure. The elongate structure magnetostrictively contracts due to the (generally 90°) repositioning of the magnetization of the elongate structure.Type: GrantFiled: January 31, 2005Date of Patent: July 21, 2009Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, James B. Restorff, Marilyn Wun-Fogle
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Patent number: 7479193Abstract: A positive magnetostrictive material such as a ferromagnetic alloy is subjected to a magnetic field during annealing treatment while being heated for a predetermined period of time at an elevated temperature below its softening temperature followed by cooling resulting in a treated ferromagnetic material having high tensile strength and positive magnetostriction properties for enhancing use thereof under tensile loading conditions. Such treatment of the ferromagnetic alloy may be augmented by application thereto of a compressive stress.Type: GrantFiled: February 11, 2005Date of Patent: January 20, 2009Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, Marilyn Wun-Fogle, James B. Restorff
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Publication number: 20030010405Abstract: Devices and methods employ FeGa alloys having excellent magnetostriction and good strength. Additionally, methods of producing preferentially oriented FeGa alloys are described.Type: ApplicationFiled: July 24, 2002Publication date: January 16, 2003Inventors: Arthur E Clark, Marilyn Wun-Fogle, James B Restorff, Sivaraman Guruswamy
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Patent number: 6489695Abstract: The efficiency of converting electrical energy into a mechanical output is maximized by alternatively matching selection of power supply for the drive coil applying a magnetic field to transducer element made of a magnetostrictive material having a near-zero magnetic anisotropy, or matching selection of the magnetostrictive material to the required magnetostriction for a given power supply.Type: GrantFiled: January 24, 2001Date of Patent: December 3, 2002Assignee: The United States of America as represented by the Secretary of the NavyInventors: Marilyn Wun-Fogle, James B. Restorff, Arthur E. Clark
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Patent number: 6300855Abstract: A high power magnetostrictive transducer element comprising a material of the formula TbxDyyHozFe2−w wherein 0.24≦x≦0.28, 0.52≦y≦0.56, 0.13≦z≦0.22, x+y+z=1, and 0≦w≦0.20 and wherein the material is prestressed by a compressive force of from about 5 to about 100 MPa.Type: GrantFiled: December 21, 1998Date of Patent: October 9, 2001Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, James B. Restorff, Marilyn Wun-Fogle
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Patent number: 6176943Abstract: A magnetostrictive wire element made of amorphous ferromagnetic material is tailored for installation within a sensor by treatment which includes annealment by heating while a stress condition is imposed thereon, and applying a DC electric current thereto during said annealment to produce a cylindrical magnetic field relative to the wire element establishing spiral magnetic anistropy during cooldown after said heating.Type: GrantFiled: January 28, 1999Date of Patent: January 23, 2001Assignee: The United States of America as represented by the Secretary of the NavyInventors: Marilyn Wun-Fogle, James B. Restorff, Arthur E. Clark
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Patent number: 6150974Abstract: A dual mode missile seeker system utilizing an infrared transparent radar tenna is disclosed. The infrared transparent radar antenna is mounted in front of and on the same axis as the infrared detector within a missile dome. The radar antenna includes spaced apart patches of infrared transparent semiconductor material and a ground plane of the same material deposited on opposite sides of an infrared and microwave transparent dielectric substrate for transmitting and receiving microwave radiation and for shielding the infrared detector array mounted behind. A radome or separate lens redirects incoming infrared radiation so as to pass through the radar antenna and focus on the infrared detector array.Type: GrantFiled: May 17, 1982Date of Patent: November 21, 2000Assignee: The United States of America as represented by the Secretary of the NavyInventors: Toshio Tasaka, Harold R. Riedl, James B. Restorff
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Patent number: 6139648Abstract: Magnetostrictive material such as Terfenol-D undergoes annealing treatment y heating for a limited period of time to an elevated temperature below the melting point, followed by cooling to a preferred magnetic state in which a compressive stress generated and applied during treatment is retained in the treated material as a built-in prestress.Type: GrantFiled: February 19, 1999Date of Patent: October 31, 2000Assignee: The United States of America as represented by the Secretary of the NavyInventors: Marilyn Wun-Fogle, James B. Restorff, Arthur E. Clark
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Patent number: 5693154Abstract: Polycrystalline or single crystal magnetostrictive alloys of the formula Tb.sub.1-x Dy.sub.x Zn.sub.w (0<x.ltoreq.0.7; 0.90.ltoreq.w.ltoreq.1.10) and Tb.sub.1-y Gd.sub.y Zn.sub.w (0<y.ltoreq.0.4; 0.90.ltoreq.w.ltoreq.1.10) and magnetostrictive transducer elements made of these alloys.Type: GrantFiled: April 3, 1996Date of Patent: December 2, 1997Assignee: The United States of America as represented by the Secretary of the NavyInventors: Arthur E. Clark, James B. Restorff, Marilyn Wun-Fogle
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Patent number: 5600239Abstract: A magnetostrictive element having a large magnetomechanical coupling factor long its axis, is selected to determine strain by measurement of changes in its electrical impedance along such axis. Such measurement is maximized by generation of current of a predetermined frequency conducted through the magnetostrictive element to correspondingly penetrate the magnetostrictive element to a substantial skin depth.Type: GrantFiled: June 16, 1995Date of Patent: February 4, 1997Assignee: The United States of America as represented by the Secretary of the NavyInventors: Kristl B. Hathaway, James B. Restorff, Marilyn Wun-Fogle, Arthur E. Clark
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Patent number: 5451821Abstract: Flux leakage resulting from interaction between the static bias flux and variable magnetic flux additively applied to obtain magnetostrictive deformation of an active actuator element, is reduced by bias flux of a separate magnetic field perpendicular to the orientation of the additively applied static bias and variable magnetic flux to improve actuator operation.Type: GrantFiled: August 30, 1993Date of Patent: September 19, 1995Assignee: The United States of America as represented by the Secretary of the NavyInventors: Joseph P. Teter, James B. Restorff