Patent US4298383A successfully refreshed from Google Patents.
US4298383A
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Low viscosity composition for forming shaped bodies
Assignee: National Standard Co
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Filing: 1979-06-25
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Granted: 1981-11-03
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Expires: 1999-06-25
Abstract
Abstract A low viscosity composition characterized by pourability comprising a high percentage by weight of particulate inorganic solids. The composition also includes a dispersant, a crosslinking agent, and a binder, with all constituents being dispersed in an aqueous base to define a slurry that may be molded, extruded, cast or otherwise shaped into bodies having a variety of configurations and possessing a high degree of physical integrity and green strength. The particulate inorganic solids may include any metal compounds and mixtures thereof capable of undergoing reduction and sintering to produce high density articles of such metals and alloys thereof.
Inventors
- 👤 John F. Joyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:10
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/001
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
28 words
A viscoelastic composition for forming shaped bodies comprising at least approximately 50% by weight of a reducible metal compound in particulate form, a binder, a dispersant, and water.
Claim 2
Dependent Claim
28 words
A viscoelastic composition for forming shaped bodies comprising at least approximately 50% by weight of a reducible metal compound in particulate form, a binder, a dispersant, and water.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein the composition comprises up to approximately 15% by weight of binder and up to approximately 1.5% by weight of dispersant.
Claim 4
Dependent Claim
22 words
The composition of claim 2 wherein the composition comprises approximately 0.5-5% by weight of binder and approximately 0.1-1.5% by weight of dispersant.
Claim 5
Dependent Claim
27 words
The composition of claim 1 wherein the binder is a member selected from the group consisting of carboxymethylcellulose, guar gums and derivatives thereof, alginates, and mixtures thereof.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein the dispersant comprises a sodium salt of a polyelectrolyte.
Claim 7
Dependent Claim
15 words
The composition of claim 1 wherein the composition comprises approximately 60-85% of reducible metal compound.
Claim 8
Dependent Claim
51 words
The composition of claim 1 wherein the metal compound is a member selected from the group consisting of the oxides of Fe, Co, Ni, Cu, Cr, Mn, Mo and W, the insoluble chlorides of Cu, Mo, W and Cr, the sulfides of Cu, Fe, Co, Ni and Mo, and mixtures thereof.
Claim 9
Dependent Claim
28 words
The composition of claim 1 wherein the metal compound is a member selected from the group consisting of the oxides of Fe, Ni, Co, Cr and mixtures thereof.
Claim 10
Dependent Claim
14 words
The composition of claim 1 wherein the metal compound is an oxide of iron.
Claim 11
Dependent Claim
20 words
The composition of claim 1 wherein the mean diameter of the metal compound particles does not exceed approximately 6 microns.
Claim 12
Dependent Claim
24 words
The composition of claim 1 wherein at least approximately 25% of the metal compound particles have a mean diameter not exceeding approximately 2.5 microns.
Claim 13
Dependent Claim
13 words
The composition of claim 1 wherein the composition further includes a crosslinking agent.
Claim 14
Dependent Claim
12 words
The composition of claim 12 wherein the crosslinking agent is ammonium pentaborate.
Claim 15
Dependent Claim
17 words
The composition of claim 1 wherein the viscosity of the composition is approximately 1,000 to 1,000,000 centipoise.
Claim 16
Independent Claim
81 words
A method of making dense metal articles comprising the steps of: (a) forming a shaped body from a viscoelastic composition comprising approximately 50% by weight of a reducible metal compound in particulate form, a binder, a dispersant, and water; (b) exposing the shaped body to a reducing environment to reduce the metal compound to free metal particles; and (c) subjecting the shaped body to a temperature sufficient to effect sintering of the free metal particles to produce a dense metal article.
Claim 17
Independent Claim
81 words
A method of making dense metal articles comprising the steps of: (a) forming a shaped body from a viscoelastic composition comprising approximately 50% by weight of a reducible metal compound in particulate form, a binder, a dispersant, and water; (b) exposing the shaped body to a reducing environment to reduce the metal compound to free metal particles; and (c) subjecting the shaped body to a temperature sufficient to effect sintering of the free metal particles to produce a dense metal article.
Claim 18
Dependent Claim
26 words
The method of claim 15 wherein the composition comprises up to approximately 15% by weight of binder and up to approximately 1.5% by weight of dispersant.
Claim 19
Dependent Claim
22 words
The method of claim 15 wherein the composition comprises approximately 0.5-1.5% by weight of binder and approximately 0.1-1.5% by weight of dispersant.
Claim 20
Dependent Claim
27 words
The method of claim 15 wherein the binder is a member selected from the group consisting of carboxymethylcellulose, guar gums and derivatives thereof, alginates, and mixtures thereof.
Claim 21
Dependent Claim
15 words
The method of claim 15 wherein the composition comprises approximately 60-85% of reducible metal compound.
Claim 22
Dependent Claim
51 words
The method of claim 15 wherein the metal compound is a member selected from the group consisting of the oxides of Fe, Co, Ni, Cu, Cr, Mn, Mo and W, the insoluble chlorides of Cu, Mo, W and Cr, the sulfides of Cu, Fe, Co, Ni and Mo, and mixtures thereof.
Claim 23
Dependent Claim
28 words
The method of claim 15 wherein the metal compound is a member selected from the group consisting of the oxides of Fe, Ni, Co, Cr and mixtures thereof.
Claim 24
Dependent Claim
14 words
The method of claim 15 wherein the metal compound is an oxide of iron.
Claim 25
Dependent Claim
21 words
The method of claim 15 wherein the binder is capable of undergoing crosslinking and the composition further includes a crosslinking agent.
Claim 26
Dependent Claim
24 words
The method of claim 23 further including the step of subjecting the shaped body to a crosslinking environment prior to reducing the metal compound.
Claim 27
Dependent Claim
31 words
The method of claim 24 wherein the crosslinking environment comprises a liquid bath containing a member selected from the group consisting of iron chlorides, nickel chloride, zinc acetate and mixtures thereof.
Claim 28
Dependent Claim
17 words
The method of claim 15 wherein the viscosity of the composition is approximately 1,000 to 1,000,000 centipoise.
Claim 29
Dependent Claim
33 words
The method of claim 15 wherein the binder is capable of undergoing crosslinking and further including the step of subjecting the shaped body to a crosslinking environment prior to reducing the metal compound.
Claim 30
Dependent Claim
31 words
The method of claim 27 wherein the crosslinking environment comprises a liquid bath containing a member selected from the group consisting of iron chlorides, nickel chloride, zinc acetate and mixtures thereof.
Claim 31
Dependent Claim
133 words
A viscoelastic composition for forming shaped bodies and having a viscosity of from about 1,000 to 1,000,000 centipoise comprising: (a) approximately 60-85% by weight of a reducible metal compound in particulate form selected from the group consisting of the oxides of Fe, Co, Ni, Cu, Cr, Mn, Mo and W, the insoluble chlorides of Cu, Mo, W and Cr, the sulfides of Cu, Fe, Co, Ni and Mo, and mixtures thereof; (b) approximately 0.5-5% by weight of a binder selected from the group consisting of carboxymethylcellulose, guar gums and derivatives thereof, alginates, and mixtures thereof; (c) approximately 0.1-1.5% by weight of a sodium salt of a polyelectrolyte; (d) and the balance water; and (e) wherein at least approximately 25% of the metal compound particles have a mean diameter not exceeding approximately 2.5 microns.
Claim 32
Dependent Claim
133 words
A viscoelastic composition for forming shaped bodies and having a viscosity of from about 1,000 to 1,000,000 centipoise comprising: (a) approximately 60-85% by weight of a reducible metal compound in particulate form selected from the group consisting of the oxides of Fe, Co, Ni, Cu, Cr, Mn, Mo and W, the insoluble chlorides of Cu, Mo, W and Cr, the sulfides of Cu, Fe, Co, Ni and Mo, and mixtures thereof; (b) approximately 0.5-5% by weight of a binder selected from the group consisting of carboxymethylcellulose, guar gums and derivatives thereof, alginates, and mixtures thereof; (c) approximately 0.1-1.5% by weight of a sodium salt of a polyelectrolyte; (d) and the balance water; and (e) wherein at least approximately 25% of the metal compound particles have a mean diameter not exceeding approximately 2.5 microns.
Claim 33
Independent Claim
167 words
A method of making dense metal articles comprising the steps of: (a) forming a shaped body from a viscoelastic composition having a viscosity of from about 1,000 to 1,000,000 centipoise and comprising: 1. approximately 60-85% by weight of a reducible metal compound in particulate form selected from the group consisting of the oxides of Fe, Co, Ni, Cu, Cr, Mn, Mo and W, the insoluble chlorides of Cu, Mo, W and Cr, the sulfides of Cu, Fe, Co, Ni and Mo, and mixtures thereof; 2. approximately 0.5-5% by weight of a binder selected from the group consisting of carboxymethylcellulose, guar gums and derivatives thereof, alginates, and mixtures thereof; 3. approximately 0.1-1.5% by weight of a sodium salt of a polyelectrolyte; 4. and the balance water; and (b) exposing the shaped body to a reducing environment to reduce the metal compound to free particles; and (c) subjecting the shaped body to a temperature sufficient to effect sintering of the free metal particles to produce a dense metal article.
Claim 34
Independent Claim
167 words
A method of making dense metal articles comprising the steps of: (a) forming a shaped body from a viscoelastic composition having a viscosity of from about 1,000 to 1,000,000 centipoise and comprising: 1. approximately 60-85% by weight of a reducible metal compound in particulate form selected from the group consisting of the oxides of Fe, Co, Ni, Cu, Cr, Mn, Mo and W, the insoluble chlorides of Cu, Mo, W and Cr, the sulfides of Cu, Fe, Co, Ni and Mo, and mixtures thereof; 2. approximately 0.5-5% by weight of a binder selected from the group consisting of carboxymethylcellulose, guar gums and derivatives thereof, alginates, and mixtures thereof; 3. approximately 0.1-1.5% by weight of a sodium salt of a polyelectrolyte; 4. and the balance water; and (b) exposing the shaped body to a reducing environment to reduce the metal compound to free particles; and (c) subjecting the shaped body to a temperature sufficient to effect sintering of the free metal particles to produce a dense metal article.
References Cited (Backward Citations)
US2842500A
Cited
US2979401A
Cited
US3052532A
Cited
US3720511A
Cited
US3672882A
Cited
US3846527A
Cited
US3567811A
Cited
US3671228A
Cited
US4010233A
Cited
US3769044A
Cited
US3705223A
Cited
US3796563A
Cited
US3888662A
Cited
US4071594A
Cited
US4089921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |