Patents by Inventor Ronald E. Rosensweig
Ronald E. Rosensweig 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: 7729504Abstract: An audio speaker has a driver unit having a support frame with a central portion forming a magnetic structure defining an annular gap around a central magnetic post, a vibration system having a diaphragm and a voice coil, the voice coil is attached to one side of the diaphragm where the vibration system is fixed to the support frame and where the voice coil is movably mounted in the annular gap, and a magnetic fluid disposed in the annular gap only in a space between one side of the voice coil and a surface of the annular gap having a higher magnetic flux density.Type: GrantFiled: January 30, 2007Date of Patent: June 1, 2010Assignee: Ferrotec CorporationInventors: Shiro Tsuda, Ronald E. Rosensweig
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Publication number: 20070189577Abstract: An audio speaker has a driver unit having a support frame with a central portion forming a magnetic structure defining an annular gap around a central magnetic post, a vibration system having a diaphragm and a voice coil, the voice coil is attached to one side of the diaphragm where the vibration system is fixed to the support frame and where the voice coil is movably mounted in the annular gap, and a magnetic fluid disposed in the annular gap only in a space between one side of the voice coil and a surface of the annular gap having a higher magnetic flux density.Type: ApplicationFiled: January 30, 2007Publication date: August 16, 2007Inventors: Shiro Tsuda, Ronald E. Rosensweig
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Patent number: 6543782Abstract: Magnetic fluid seals containing housings, magnets, pole pieces, gaps, magnetic fluids, shafts and bearings of standard type are modified to permit operation at two levels of magnetic intensity in the gaps. During exposure to the operating pressure difference that a seal is designed to withhold, the magnetic field intensity in the gaps is maintained at a relatively low intensity. Subsequently, the magnetic field intensity in the gaps is increased to yield burst-free operation. Various embodiments for adjusting the magnetic field intensity are disclosed. These include: magnetic fluid seal with a variable magnet to pole-block spacing; seal with hollow-shaft flux intensifier; seal with surrounding flux diverter; and seal with an internal magnetic coil that furnishes opposing magnetomotive force.Type: GrantFiled: April 11, 2001Date of Patent: April 8, 2003Assignee: Ferrotec (USA) CorporationInventors: Ronald E. Rosensweig, Kuldip Raj, Thomas J. Black, Jr.
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Patent number: 6068785Abstract: A slurry is formed of particles of a non-magnetic oxide of iron (.alpha.-Fe.sub.2 O.sub.3), an oil carrier liquid and a surfactant. The slurry is then processed in an attrition mill where kinetic energy is applied to the slurry to convert the .alpha.-Fe.sub.2 O.sub.3 particles to magnetic iron oxide particles to form an oil-based ferrofluid. In order to increase the saturation magnetization of the resulting ferrofluid, a beneficial agent is brought into contact with the slurry during processing in the attrition mill. The beneficial agent can be a magnetic material, such as elemental iron, or can be water. A ferrofluid can also be formed by creating a powder of surfactant-coated magnetic particles and using an attrition mill to coat the particles with a second surfactant and suspend the coated particles in a carrier liquid.Type: GrantFiled: February 10, 1998Date of Patent: May 30, 2000Assignee: Ferrofluidics CorporationInventors: Kuldip Raj, Lutful M. Aziz, Ronald E. Rosensweig
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Patent number: 5851416Abstract: A ferrofluid composition comprising a colloidal dispersion of finely divided magnetic particles in a silicone oil carrier in which the surfaces of the magnetic particles are modified with (a) a first surfactant comprising a hydrocarbon having at least one polar group and (b) a second surfactant comprising a silicone oil surfactant having at least one polar group and which is soluble in the silicone oil carrier.Type: GrantFiled: February 12, 1997Date of Patent: December 22, 1998Assignee: Ferrofluidics CorporationInventors: Kuldip Raj, Ronald E. Rosensweig, Lutful M. Aziz
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Patent number: 5445020Abstract: A system that will indicate tire inflation. A two-dimensional array of sensors is used to determine the distribution of contact forces over the footprint of a pneumatic tire. A neural network may be employed to classify the patterns of force sensed in this manner, and to closely estimate the actual tire inflation pressure.Type: GrantFiled: December 2, 1993Date of Patent: August 29, 1995Assignee: Exxon Research and Engineering CompanyInventor: Ronald E. Rosensweig
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Patent number: 5396817Abstract: A system that will indicate tire inflation and vehicle velocity. An array of strain gage sensors is used to determine the distribution of contact forces along the width of a pneumatic tire. A neural network may be employed to classify the patterns of force sensed in this manner. Additional processing of the data permits vehicle velocity to also be determined.Type: GrantFiled: November 29, 1991Date of Patent: March 14, 1995Assignee: Exxon Research and Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: 4687878Abstract: Magnetizable adsorbent particles suitable for use in a magnetically stabilized fluidized bed and with a smaller particle size than conventionally formed composite adsorbents are prepared by introducing magnetizable particles such as magnetite or iron into a reaction mixture for forming a zeolite having adsorbent properties, such as zeolite Y. The zeolite is formed as a coating on the magnetizable particle.Type: GrantFiled: May 7, 1986Date of Patent: August 18, 1987Assignee: Exxon Research & Engineering Co.Inventors: Dominicus J. M. van der Vleugel, Klaas Hoving, Theodorus M. Wortel, Ronald E. Rosensweig, Lovat V. C. Rees
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Patent number: 4668379Abstract: This invention relates to a fluidized bed process. More particularly, the present invention is a process for operating a magnetically stabilized fluidized bed by using a magnetizable fluid to fluidize solid particulate nonmagnetizable fluidizable particles. The operating conditions are such that there is substantially no random motion or time-varying pressure fluctuation as measured at a point within the bed.Type: GrantFiled: May 23, 1985Date of Patent: May 26, 1987Assignee: Exxon Research and Engineering CompanyInventors: Ronald E. Rosensweig, George Ciprios
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Patent number: 4617282Abstract: Magnetizable adsorbent particles suitable for use in a magnetically stabilized fluidized bed and with a smaller particle size than conventionally formed composite adsorbents are prepared by introducing magnetizable particles such as magnetite or iron into a reaction mixture for forming a zeolite having adsorbent properties, such as zeolite Y. The zeolite is formed as a coating on the magnetizable particle.Type: GrantFiled: June 22, 1984Date of Patent: October 14, 1986Assignee: Exxon Research & Engineering Co.Inventors: Dominicus J. M. van der Vleugel, Klaas Hoving, Theodorus M. Wortel, Ronald E. Rosensweig, Lovat V. C. Rees
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Patent number: 4596283Abstract: This invention relates to a process for magnetically stabilizing the operation of contactor columns containing immiscible fluids passing in dispersed countercurrent flow. The process operates by including, in an appropriate fluid phase, a magnetizable component in an amount which does not substantially change the nature of the liquid in that phase and, further, imposing upon at least a portion of the column containing dispersed phases, a magnetic field sufficient to result in substantially diminished radial mixing of the phase containing the magnetizable substance and diminished coalescence of the dispersed phase. The phase containing the magnetizable component passes through the stabilized zone in substantial plug flow.Type: GrantFiled: May 23, 1985Date of Patent: June 24, 1986Assignee: Exxon Research and Engineering Co.Inventors: George Ciprios, Ronald E. Rosensweig
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Patent number: 4579173Abstract: A process for the recovery of a fluid from a porous formation whereby fingering effects are controlled by applied magnetic field. The process comprises injecting a displacement fluid and ferrofluid, or a ferrofluid-containing displacement fluid, in an effective amount to displace fluid from the formation, applying a magnetic field containing a gradient of field intensity across said formation, driving the displaced fluid through the formation and recovering the displaced first fluid.Type: GrantFiled: September 30, 1983Date of Patent: April 1, 1986Assignee: Exxon Research and Engineering Co.Inventors: Ronald E. Rosensweig, Markus Zahn
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Patent number: 4565793Abstract: A fluidized bed process is disclosed which comprises subjecting a bed comprised of solid particulate magnetizable, fluidizable material within an external force field wherein at least a portion of the bed containing said solid particulate magnetizable and fluidizable material and fluidizing fluid are subjected to a nontime varying and substantially uniform applied magnetic field having a substantial component along the direction of the external force field such that said solid particulate magnetizable and fluidizable material has a component of magnetization along the direction of the external force field and wherein at least a portion of said bed containing the solid particulate magnetizable and fluidizable material is fluidized by a flow of fluid opposing said external force field at a superficial fluid velocity ranging between:(a) more than the normal minimum fluidization superficial fluid velocity required to fluidize said bed in the absence of said applied magnetic field; and,(b) less than the superficiaType: GrantFiled: October 28, 1982Date of Patent: January 21, 1986Assignee: Exxon Research and Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: 4541924Abstract: A hydrotreating process wherein composite catalyst particles are formed into a magnetically stabilized fluidized bed and contacted with a fluid, preferably gas. The composition is one which exhibits high induced magnetism in a small applied magnetic field when formed into a magnetically stabilized fluidized bed. The particles contain a non-ferromagnetic component, or components, composited with one or a plurality of elongated ferromagnetic components, oriented and present in each of said particles in relatively low concentration, based on the total volume of the particles.Type: GrantFiled: April 18, 1983Date of Patent: September 17, 1985Assignee: Exxon Research and Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: 4394281Abstract: A composition which exhibits high induced magnetism in a small applied magnetic field when formed into a magnetically stabilized fluidized bed and which comprises particles containing a nonferromagnetic component, or components, composited with one or a plurality of elongated ferromagnetic components oriented and present in each of said particles in relatively low concentration, based on the total volume of the particles; and a process wherein such composite particles are formed into a magnetically stabilized fluidized bed and contacted with a fluid, preferably gas.Type: GrantFiled: September 22, 1982Date of Patent: July 19, 1983Assignee: Exxon Research and Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: 4296080Abstract: A fluidized bed process is disclosed which comprises subjecting a bed comprised of solid particulate magnetizable, fluidizable material within an external force field wherein at least a portion of the bed containing said solid particulate magnetizable and fluidizable material and fluidizing fluid are subjected to a nontime varying and substantially uniform applied magnetic field having a substantial component along the direction of the external force field such that said solid particulate magnetizable and fluidizable material has a component of magnetization along the direction of the external force field and wherein at least a portion of said bed containing the solid particulate magnetizable and fluidizable material is fluidized by a flow of fluid opposing said external force field at a superficial fluid velocity ranging between:(a) more than the normal minimum fluidization superficial fluid velocity required to fluidize said bed in the absence of said applied magnetic field; and,(b) less than the superficiaType: GrantFiled: August 21, 1978Date of Patent: October 20, 1981Assignee: Exxon Research & Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: 4136016Abstract: A hydrocarbon conversion process, such as catalytic desulfurization of a vaporized petroleum feedstock with hydrogen or catalytic reforming of a vaporized hydrocarbon feedstock, is carried out by passing the gaseous medium upwardly through a fluidized bed of magnetizable composite particles having catalytic activity for hydrocarbon conversion and which contain 2 to 40 volume % ferro- or ferrimagnetic material to a nontime varying (direct current) and substantially uniform applied magnetic field having a substantial component along the direction of gravity such that the composite particles have a component of magnetization along the direction of gravity.Type: GrantFiled: January 3, 1978Date of Patent: January 23, 1979Assignee: Exxon Research & Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: 4115927Abstract: A fluidized bed process is disclosed which comprises subjecting a bed comprised of solid particulate magnetizable, fluidizable material within an external force field wherein at least a portion of the bed containing said solid particulate magnetizable and fluidizable material and fluidizing fluid are subjected to a nontime varying and substantially uniform applied magnetic field having a substantial component along the direction of the external force field such that said solid particulate magnetizable and fluidizable material has a component of magnetization along the direction of the external force field and wherein at least a portion of said bed containing the solid particulate magnetizable and fluidizable material is fluidized by a flow of fluid opposing said external force field at a superficial fluid velocity ranging between:(a) more than the normal minimum fluidization superficial fluid velocity required to fluidize said bed in the absence of said applied magnetic field; and,(b) less than the superficiaType: GrantFiled: April 11, 1977Date of Patent: September 26, 1978Assignee: Exxon Research & Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: RE31186Abstract: A hydrocarbon conversion process, such as catalytic desulfurization of a vaporized petroleum feedstock with hydrogen or catalytic reforming of a vaporized hydrocarbon feedstock, is carried out by passing the gaseous medium upwardly through a fluidized bed of magnetizable composite particles having catalytic activity for hydrocarbon conversion and which contain 2 to 40 volume % ferro- or ferrimagnetic material .[.to.]. .Iadd.in .Iaddend.a nontime varying (direct current) and substantially uniform applied magnetic field having a substantial component along the direction of gravity such that the composite particles have a component of magnetization along the direction of gravity.Type: GrantFiled: December 30, 1980Date of Patent: March 22, 1983Assignee: Exxon Research and Engineering Co.Inventor: Ronald E. Rosensweig
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Patent number: RE31439Abstract: A fluidized bed process is disclosed which comprises subjecting a bed comprised of solid particulate magnetizable, fluidizable material within an external force field wherein at least a portion of the bed containing said solid particulate magnetizable and fluidizable material and fluidizing fluid are subjected to a nontime varying and substantially uniform applied magnetic field having a substantial component along the direction of the external force field such that said solid particulate magnetizable and fluidizable material has a component of magnetization along the direction of the external force field and wherein at least a portion of said bed containing the solid particulate magnetizable and fluidizable material is fluidized by a flow of fluid opposing said external force field at a superficial fluid velocity ranging between:(a) more than the normal minimum fluidization superficial fluid velocity required to fluidize said bed in the absence of said applied magnetic field; and,(b) less than the superficiaType: GrantFiled: September 24, 1980Date of Patent: November 15, 1983Assignee: Exxon Research and Engineering Co.Inventor: Ronald E. Rosensweig