MAGNETORHEOLOGICAL FLUIDS AND METHODS OF MAKING AND USING THE SAME
First Claim
Patent Images
1. A product comprising:
- a magnetorheological fluid having an on-state yield stress when a magnetic field is applied thereto and comprising;
a carrier fluid;
magnetizable particles suspended in the carrier fluid;
wherein the suspension of the magnetizable particles in the carrier fluid remains essentially homogenous indefinitely in the absence of the magnetic field;
wherein the on-state yield stress of the magnetorheological fluid is greater than or equal to that of poly(alpha)olefin fluid containing the same concentration of magnetizable particles; and
wherein the off-state viscosity of the magnetorheological fluid is between about 0.4 and about 12 Pascal-seconds at 40°
C.
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Accused Products
Abstract
One embodiment includes a magnetorheological fluid having an on-state yield stress when a magnetic field is applied thereto and comprising a carrier fluid and magnetizable particles suspended in the carrier fluid, and wherein the suspension of the magnetizable particles in the carrier fluid remains essentially homogenous indefinitely in the absence of the magnetic field, and wherein the on-state yield stress of the magnetorheological fluid is greater than or equal to that of poly(alpha)olefin fluid containing the same concentration of magnetizable particles, and wherein the off-state viscosity of the magnetorheological fluid is between about 0.4 and about 12 Pascal-seconds at 40° C.
73 Citations
45 Claims
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1. A product comprising:
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a magnetorheological fluid having an on-state yield stress when a magnetic field is applied thereto and comprising; a carrier fluid; magnetizable particles suspended in the carrier fluid; wherein the suspension of the magnetizable particles in the carrier fluid remains essentially homogenous indefinitely in the absence of the magnetic field; wherein the on-state yield stress of the magnetorheological fluid is greater than or equal to that of poly(alpha)olefin fluid containing the same concentration of magnetizable particles; and wherein the off-state viscosity of the magnetorheological fluid is between about 0.4 and about 12 Pascal-seconds at 40°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A product comprising:
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a tunable device comprising at least one chamber comprising magnetorheological fluid having an on-state yield stress when a magnetic field is applied thereto and wherein the magnetorheological fluid comprises; a carrier fluid; magnetizable particles suspended in the carrier fluid; wherein the suspension of the magnetizable particles in the carrier fluid remains essentially homogenous indefinitely in the absence of the magnetic field; wherein the on-state yield stress of the magnetorheological fluid is greater than or equal to that of poly(alpha)olefin fluid containing the same concentration of magnetizable particles; and wherein the off-state viscosity of the magnetorheological fluid is between about 0.4 and about 12 Pascal-seconds at 40°
C. - View Dependent Claims (42, 43)
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44. A method comprising:
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applying a magnetic field to magnetorheological fluid to increase the yield-stress of the magnetorheological fluid such that its on-state yield stress is greater than or equal to that of poly(alpha)olefin fluid containing the same concentration of magnetizable particles, wherein the magnetorheological fluid comprises; a carrier fluid; magnetizable particles suspended in the carrier fluid; wherein the suspension of the magnetizable particles in the carrier fluid remains essentially homogenous indefinitely in the absence of the magnetic field; and wherein the off-state viscosity of the magnetorheological fluid is between about 0.4 and about 12 Pascal-seconds at 40°
C. - View Dependent Claims (45)
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Specification