US3206338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-pyrophoric, ferromagnetic acicular particles and their preparation
Assignee: EIDP Inc
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Filing: 1963-05-10
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Granted: 1965-09-14
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Expires: 1983-05-10
Abstract
No abstract record available.
Inventors
- 👤 Henry C Miller
- 👤 Alfred L Oppegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:44
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/065; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70605; G11B5/70615
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD FOR PREPARING FERROMAGNETIC, NONPYROPHORIC ACICULAR PARTICLES COMPRISING REACTING IN A MAGNETIC FIELD OF AT LEAST 100 OERSTEDS A SOLUTION OF AN IRON SALT WITH A METAL BOROHYDRIDE SOLUTION, COLLECTING THE PRECIPITATE, WASHING IT PROMPTLY, QUICKLY AND THOROUGHLY WITH WATER AND THEN WITH A WATER-MISCIBLE ORGANIC SOLVENT AND AIR-DRYING THE PRECIPITATE, THE PROMPT, QUICK AND THOROUGH WASHING AND AIR-DRYING STEPS BEING EFFECTED TO ACHIEVE CONTROLLED OXIDATION OF THE RESULTING PARTICLES.
Claim 2
Independent Claim
71 words
A METHOD FOR PREPARING FERROMAGNETIC, NONPYROPHORIC ACICULAR PARTICLES COMPRISING REACTING IN A MAGNETIC FIELD OF AT LEAST 100 OERSTEDS A SOLUTION OF AN IRON SALT WITH A METAL BOROHYDRIDE SOLUTION, COLLECTING THE PRECIPITATE, WASHING IT PROMPTLY, QUICKLY AND THOROUGHLY WITH WATER AND THEN WITH A WATER-MISCIBLE ORGANIC SOLVENT AND AIR-DRYING THE PRECIPITATE, THE PROMPT, QUICK AND THOROUGH WASHING AND AIR-DRYING STEPS BEING EFFECTED TO ACHIEVE CONTROLLED OXIDATION OF THE RESULTING PARTICLES.
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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |