US5714536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic nanocompass compositions and processes for making and using
Assignee: Xerox Corp
•
Filing: 1996-01-11
•
Granted: 1998-02-03
•
Expires: 2016-01-11
Abstract
Abstract A magnetic composition comprising nanocomposite particles comprising from about 0.001 to about 60 weight percent of magnetic nanocrystalline particles dispersed in from about 40 to about 99.999 weight percent of a discrete phase matrix, and a continuous phase matrix, wherein the discrete phase resides in interstices within the continuous phase matrix.
Inventors
- 👤 Ronald F. Ziolo
- 👤 Javier Tejada Palacios
- 👤 Xixiang Zhang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:17
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; B; B82; B82Y; B82Y25/00; C08K3/18; C08K3/20; C08K3/22; H; H01; H01F; H01F1/00; H01F1/0036; H01F1/0045; H01F1/0063; H01F1/44; H01F1/445
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
115 words
A magnetic composition comprising nanocomposite particles comprising from about 0.001 to about 60 weight percent of magnetic nanocrystalline particles selected from the group consisting of metal oxides, elemental metals and mixtures thereof, wherein the magnetic nanocrystalline particles are from about 0.0001 to about 0.1 microns in diameter and wherein the said particles are dispersed in from about 40 to about 99.999 weight percent of a discrete phase matrix selected from the group consisting of ion exchange resins, ion exchange metal oxides and mixtures thereof and continuous phase matrix selected from the group consisting of a solid, a rigid foam and a gel, wherein the discrete phase resides in the interstices within the continuous phase matrix.
Claim 2
Dependent Claim
115 words
A magnetic composition comprising nanocomposite particles comprising from about 0.001 to about 60 weight percent of magnetic nanocrystalline particles selected from the group consisting of metal oxides, elemental metals and mixtures thereof, wherein the magnetic nanocrystalline particles are from about 0.0001 to about 0.1 microns in diameter and wherein the said particles are dispersed in from about 40 to about 99.999 weight percent of a discrete phase matrix selected from the group consisting of ion exchange resins, ion exchange metal oxides and mixtures thereof and continuous phase matrix selected from the group consisting of a solid, a rigid foam and a gel, wherein the discrete phase resides in the interstices within the continuous phase matrix.
Claim 3
Dependent Claim
22 words
A magnetic composition in accordance with claim 1 wherein the magnetic nanocrystalline particles are magnetically rotationally free and single domain in character.
Claim 4
Dependent Claim
18 words
A magnetic composition in accordance with claim 1 wherein the magnetic nanocrystalline particles are free of magnetic memory.
Claim 5
Dependent Claim
46 words
A magnetic composition in accordance with claim 1 wherein the continuous phase matrix is comprised of an alcohol or mixture of alcohols with from 1 to about 5 carbon atoms and which phase is at a temperature at or below the freezing point of the alcohol.
Claim 6
Dependent Claim
29 words
A magnetic composition in accordance with claim 1 wherein the continuous phase matrix is a gel comprised of a mixture of a glycol and hydrophilic fumed metal oxide particles.
Claim 7
Dependent Claim
18 words
A magnetic composition in accordance with claim 1 wherein the continuous phase matrix is an alkyl acrylate polymer.
Claim 8
Dependent Claim
19 words
A magnetic composition in accordance with claim 1 wherein the continuous phase matrix is a liquid gelled acrylic polymer.
Claim 9
Dependent Claim
26 words
A magnetic composition in accordance with claim 1 wherein the interstices are a void or voids of from about 0.001 to about 1.0 micron in diameter.
Claim 10
Dependent Claim
26 words
A magnetic composition in accordance with claim 1 wherein the interstices are a void or voids of from about 0.005 to about 0.1 microns in diameter.
Claim 11
Dependent Claim
26 words
A magnetic composition in accordance with claim 1 wherein the interstices are a void or voids of from about 0.005 to about 0.05 microns in diameter.
Claim 12
Dependent Claim
27 words
A magnetic composition in accordance with claim 1 wherein the composition is free of magnetic interaction between individual magnetic nanocrystalline particles, and individual discrete phase matrix particles.
Claim 13
Dependent Claim
21 words
A magnetic composition in accordance with claim 1 wherein the composition is free of barriers to a change in system magnetization(M).
Claim 14
Dependent Claim
42 words
A magnetic composition in accordance with claim 1 wherein the magnetic response of the composition becomes infinite up to about the saturation magnetization of the composition upon application of a magnetic field (H) of from about 10 -8 to about 10 Tesla.
Claim 15
Dependent Claim
29 words
A magnetic composition in accordance with claim 1 wherein the initial magnetic saturation is from about 0.01 emu per gram to about the bulk saturation magnetization of the composition.
Claim 16
Dependent Claim
26 words
A magnetic composition in accordance with claim 1 wherein the composition has a magnetic saturation moment of from about 0.1 to about 30 emu per gram.
Claim 17
Dependent Claim
30 words
A magnetic composition in accordance with claim 1 wherein the composition is superparamagnetic at about 4° K. to about 500° K. and is substantially instantaneously responsive to a magnetic field.
Claim 18
Dependent Claim
35 words
A magnetic composition in accordance with claim 1 wherein the magnetic nanocrystalline particles are formed from magnetic metal ions selected from the group consisting of transition metal elements, a lanthanide series element, and mixtures thereof.
Claim 19
Dependent Claim
38 words
A magnetic composition in accordance with claim 1 wherein the magnetic nanocrystalline particles are gamma phase iron oxide particles of from about 10 nanometers to about 0.1 microns in diameter and are uniformly dispersed in the discrete phase.
Claim 20
Dependent Claim
21 words
A magnetic composition in accordance with claim 1 wherein the composition has an initial magnetic permeability of greater than about 1.0.
Claim 21
Dependent Claim
25 words
A magnetic composition in accordance with claim 1 wherein the composition has an initial magnetic permeability of from about 1.1 to about 10 7 .
Claim 22
Dependent Claim
14 words
A magnetic composition in accordance with claim 1 wherein the composition is electrically nonconductive.
Claim 23
Dependent Claim
21 words
A magnetic composition in accordance with claim 1 wherein the composition is free of quantum tunneling of magnetization above 0° K.
Claim 24
Dependent Claim
26 words
A magnetic composition in accordance with claim 1 further comprising magnetic nanoparticulate particles selected from the group consisting of ferromagnetic materials, ferrimagnetic materials, and mixtures thereof.
Claim 25
Dependent Claim
32 words
A magnetic composition in accordance with claim 1 wherein the nanocrystalline particles contained in the discrete phase are physically separated from the walls of the interstices formed by the continuous phase matrix.
Claim 26
Dependent Claim
40 words
A magnetic composition in accordance with claim 1 wherein the nanocomposite particles comprise from about 0.01 to about 40 weight percent of magnetic nanocrystalline particles dispersed in from about 50 to about 90 weight percent of the discrete phase matrix.
References Cited (Backward Citations)
US4238558A
Cited
US4474866A
Cited
US5431967A
Cited
US5316699A
Cited
US5322756A
Cited
US5362417A
Cited
US5567564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-02 | 2001-08-04 | 2002-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-02 | 2005-08-04 | 2006-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-02 | 2009-08-04 | 2010-02-03 | $7700.00 | Window Closed / Lapsed |