Patent US2339475A successfully refreshed from Google Patents.
US3085246A
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US
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Magnetic recording method
Assignee: International Business Machines Corp
•
Filing: 1958-11-26
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Granted: 1963-04-09
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Expires: 1978-11-26
Abstract
No abstract record available.
Inventors
- 👤 Richard C Cowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B5/48; G11B5/49; G11B5/4907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2856256A
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US2844434A
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US2764463A
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GB763869A
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US2894796A
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GB769727A
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GB776401A
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US2862199A
Cited
US2824776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |