US2936286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of acicular iron particles
Assignee: Dictaphone Corp
•
Filing: 1955-07-25
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Granted: 1960-05-10
•
Expires: 1975-07-25
Abstract
No abstract record available.
Inventors
- 👤 Feick George
- 👤 Harold F Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70605; G11B5/70615; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF MAKING ACICULAR IRON PARTICLES WHICH COMPRISES HEATING ACICULAR IRON OXIDE PARTICLES TO A TENPERATURE OF 500* TO 1000*C., REDUCING THE HEAT-TREATED IRON OXIDE IN A MOLTEN INORGANIC REACTION MEDIUM AT A TEMPERATURE BELOW 308*C. WITH A REDUCING AGENT WHICH IS AN ALKALI METAL HYDRIDE TO FORM A REACTION MIXTURE CONTAINING ACICULAR IRON PARTICLES, AND RECOVERING SAID ACICULAR IRON PARTICLES FROM SAID REACTION MIXTURE.
Claim 2
Independent Claim
66 words
THE METHOD OF MAKING ACICULAR IRON PARTICLES WHICH COMPRISES HEATING ACICULAR IRON OXIDE PARTICLES TO A TENPERATURE OF 500* TO 1000*C., REDUCING THE HEAT-TREATED IRON OXIDE IN A MOLTEN INORGANIC REACTION MEDIUM AT A TEMPERATURE BELOW 308*C. WITH A REDUCING AGENT WHICH IS AN ALKALI METAL HYDRIDE TO FORM A REACTION MIXTURE CONTAINING ACICULAR IRON PARTICLES, AND RECOVERING SAID ACICULAR IRON PARTICLES FROM SAID REACTION MIXTURE.
References Cited (Backward Citations)
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Cited
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US2377876A
Cited
US2550803A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |