US2967794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine particle magnets
Assignee: Handy and Harman
•
Filing: 1956-09-12
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Granted: 1961-01-10
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Expires: 1976-09-12
Abstract
No abstract record available.
Inventors
- 👤 Charles D Coxe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:30
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/02; C22C47/025; B; B22; B22F; B22F1/00; B22F1/06; B22F1/062; B22F1/09; B22F9/00; B22F9/16; B82; B82Y; B82Y25/00; C22C33/00; C22C33/02; C22C47/14; H; H01; H01F; H01F1/00; H01F1/0036; H01F1/0072; H01F1/0081; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/083; B22F2998/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12424; Y10T428/12431; Y10T428/12486
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A WROUGHT MAGNETIC MATERIAL COMPRISING METALLIC FILAMENTARY FERROMAGNETIC PARTICLES HAVING A HIGH LENGTHTO-DIAMETER RATIO, SAID PARTICLES BEING ORIENTED WITH THEIR LONG DIMENSIONS SUBSTANTIALLY PARALLEL AND BEING DISPERSED THROUGH A SOLID NON-MAGNETIC MATRIX. 5. PROCESS FOR MANUFACTURING FERROMAGNETIC MATERIAL INCLUDING ALIGNED FERROMAGNETIC PARTICLES HAVING A LENGTH-TO-DIAMETER RATIO IN EXCESS OF 100 AND A DIAMETER OF THE ORDER OF 1 MICRON COMPRISING THE STEPS OF INTIMATELY MIXING POWDERED FERROMAGNETIC PARTICLES WITH A NON-FERROMAGNETIC POWDER TO PRODUCE A MIXTURE CONTAINING SUBSTANTIALLY FROM 5% TO 75% OF FERROMAGNETIC POWDER BY VOLUME, COMPACTING AND SINTERING SAID MIXTURE INTO A BILLET, AND COLD WORKING SAID BILLET BY REPEATED DRAWING AND ANNEALING OPERATIONS TO REDUCE THE DIAMETER OF SAID FERROMAGNETIC PARTICLES TO A DIMENSION OF THE ORDER OF MAGNITUDE OF 1 MICRON.
Claim 2
Dependent Claim
125 words
A WROUGHT MAGNETIC MATERIAL COMPRISING METALLIC FILAMENTARY FERROMAGNETIC PARTICLES HAVING A HIGH LENGTHTO-DIAMETER RATIO, SAID PARTICLES BEING ORIENTED WITH THEIR LONG DIMENSIONS SUBSTANTIALLY PARALLEL AND BEING DISPERSED THROUGH A SOLID NON-MAGNETIC MATRIX. 5. PROCESS FOR MANUFACTURING FERROMAGNETIC MATERIAL INCLUDING ALIGNED FERROMAGNETIC PARTICLES HAVING A LENGTH-TO-DIAMETER RATIO IN EXCESS OF 100 AND A DIAMETER OF THE ORDER OF 1 MICRON COMPRISING THE STEPS OF INTIMATELY MIXING POWDERED FERROMAGNETIC PARTICLES WITH A NON-FERROMAGNETIC POWDER TO PRODUCE A MIXTURE CONTAINING SUBSTANTIALLY FROM 5% TO 75% OF FERROMAGNETIC POWDER BY VOLUME, COMPACTING AND SINTERING SAID MIXTURE INTO A BILLET, AND COLD WORKING SAID BILLET BY REPEATED DRAWING AND ANNEALING OPERATIONS TO REDUCE THE DIAMETER OF SAID FERROMAGNETIC PARTICLES TO A DIMENSION OF THE ORDER OF MAGNITUDE OF 1 MICRON.
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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) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |