US2919431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the magnetic recording of data
Assignee: International Business Machines Corp
•
Filing: 1956-08-13
•
Granted: 1959-12-29
•
Expires: 1976-08-13
Abstract
No abstract record available.
Inventors
- 👤 Stephen H Blackford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:29
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/14; G06F11/1497; G06F3/00; G06F3/06; G06F3/0601; G06F3/0668; G06F3/0671; G06F3/0673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2378383A
Cited
US2378389A
Cited
US2656407A
Cited
US2764634A
Cited
US2690913A
Cited
US2700755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |