US3663318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making ferromagnetic metal powders
Assignee: EIDP Inc
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Filing: 1970-10-05
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Granted: 1972-05-16
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Expires: 1990-10-05
Abstract
Abstract Disclosed herein is a process for making ferromagnetic powders from salts of iron, cobalt, nickel, and from 0 to 35 percent of a chromium salt, by total weight of the salts. The process comprises reacting the metal salt or salts with a reducing agent of (a) an amine-borane and (b) a tetrahydroborate.
Inventors
- 👤 Ernest L Little Jr
- 👤 Jack D Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:20
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/065
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
13 words
A process according to claim 1, wherein one of the metals is iron.
Claim 2
Dependent Claim
13 words
A process according to claim 1, wherein one of the metals is cobalt.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein one of the metals is nickel.
Claim 4
Dependent Claim
13 words
A process according to claim 1, wherein one of the metals is chromium.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the salts are selected from the group consisting of halides, sulfates, nitrates, fluoroborates, formates, acetates and propionates.
Claim 6
Dependent Claim
12 words
A process according to claim 1, wherein the tetrahydroborate is sodium tetrahydroborate.
Claim 7
Dependent Claim
12 words
A process according to claim 1, wherein the tetrahydroborate is potassium tetrahydroborate.
Claim 8
Dependent Claim
12 words
A process according to claim 1 carried out in a magnetic field.
Claim 9
Dependent Claim
26 words
A process according to claim 1, employing an amine-borane of the formula, R3 nNHn.BH3, wherein the R''s are lower alkyl and n is 0 or 1.
Claim 10
Dependent Claim
12 words
A process according to claim 10, wherein the amine-borane is dimethylamine borane.
Claim 11
Dependent Claim
33 words
A process according to claim 10, wherein the amine-borane is dimethylamine borane and the tetrahydroborate is sodium tetrahydroborate and the mole ratio is between about 6 to 1 to 400 to 1, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |