US2813259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recording systems
Assignee: Monroe Calculating Machine Co
•
Filing: 1954-04-12
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Granted: 1957-11-12
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Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 Burkhart William Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:40
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/18; G06F11/183; G06F11/1608; G06F11/1612
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2609143A
Cited
US2628346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |