Patent US2954303A successfully refreshed from Google Patents.
US2954303A
Expired / Lapsed
US
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Production of ferromagnetic oxide
Assignee: American Pigment Corp
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Filing: 1956-04-17
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Granted: 1960-09-27
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Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 Westcott Horace Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:56
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70678; G11B5/70684; G11B5/70689; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31826; Y10T428/31833; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A MAGNETIC RECORD MEMBER HAVING A NON-MAGNETIC CARRIER AND A MAGNETIC TRACK ADHERENTLY BONDED THERETO OF MAGNETIC MATERIAL AND BINDER COMPOSITION, SAID MAGNETIC MATERIAL HAVING A COERCIVITY OF NOT GREATER THAN ABOUT 300 OERSTEDS AND COMPRISING GROUND PARTICLES OF AT LEAST ONE MAGNETICALLY ANISOTROPIC, GASEOUSLY REDUCED SYNTHETIC IRON OXIDE SELECTED FROM THE GROUP CONSISTING OF FERROSOFERRIC OXIDE FE2O3FEO AND GAMMA FERRIC OXIDE FE2O3, SAID IRON OXIDE HAVING BEEN GROUND UNDER NONAQUEOUS CONDITIONS TO SUCH FINE SIZE AND SMOOTH SURFACE AS TO HAVE AN OIL ABSORPTION CHARACTERISTIC NOT GREATER THAN ABOUT 0.45 ML. OF OIL PER GRAM OF OXIDE, AND BEING CAPABLE UPON ORIENTATION OF YIELDING A BR/BS VALUE RANGING FROM 0.5 TO 0.9.
Claim 2
Dependent Claim
113 words
A MAGNETIC RECORD MEMBER HAVING A NON-MAGNETIC CARRIER AND A MAGNETIC TRACK ADHERENTLY BONDED THERETO OF MAGNETIC MATERIAL AND BINDER COMPOSITION, SAID MAGNETIC MATERIAL HAVING A COERCIVITY OF NOT GREATER THAN ABOUT 300 OERSTEDS AND COMPRISING GROUND PARTICLES OF AT LEAST ONE MAGNETICALLY ANISOTROPIC, GASEOUSLY REDUCED SYNTHETIC IRON OXIDE SELECTED FROM THE GROUP CONSISTING OF FERROSOFERRIC OXIDE FE2O3FEO AND GAMMA FERRIC OXIDE FE2O3, SAID IRON OXIDE HAVING BEEN GROUND UNDER NONAQUEOUS CONDITIONS TO SUCH FINE SIZE AND SMOOTH SURFACE AS TO HAVE AN OIL ABSORPTION CHARACTERISTIC NOT GREATER THAN ABOUT 0.45 ML. OF OIL PER GRAM OF OXIDE, AND BEING CAPABLE UPON ORIENTATION OF YIELDING A BR/BS VALUE RANGING FROM 0.5 TO 0.9.
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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) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |