US3661556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making ferromagnetic metal powders
Assignee: EIDP Inc
•
Filing: 1969-03-03
•
Granted: 1972-05-09
•
Expires: 1989-03-03
Abstract
Abstract The magnetic properties of ferromagnetic metal powders made by the borohydride reduction of appropriate mixtures of iron, cobalt, nickel and optionally chromium salts can be modified by the addition of complex forming agents to the reaction medium.
Inventors
- 👤 John Eric Jolley
- 👤 Ernest Lewis Little Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:03
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/065
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
The process of claim 1 wherein said complexing agent is selected from glycine, lactic acid, sodium glycollate, sodium citrate, sodium Salts of ethylenediaminetetraacetic acid, urea, sodium succinate and ascorbic acid.
Claim 2
Dependent Claim
18 words
The process of claim 2 wherein said complexing agent is selected from the sodium salts of ethylenediaminetetraacetic acid.
Claim 3
Dependent Claim
11 words
Process of claim 2 wherein said complexing agent is ascorbic acid.
Claim 4
Dependent Claim
11 words
Process of claim 2 wherein said complexing agent is sodium citrate.
Claim 5
Dependent Claim
11 words
Process of claim 2 wherein said complexing agent is sodium glycollate.
References Cited (Backward Citations)
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Cited
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Cited
US3379539A
Cited
US3567525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |