US2749440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic valve circuits
Assignee: British Tabulating Machine Co Ltd
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Filing: 1950-08-04
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Granted: 1956-06-05
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Expires: 1970-08-04
Abstract
No abstract record available.
Inventors
- 👤 Cartwright John Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:53
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/74; G; G06; G06F; G06F7/00; G06F7/02; G06F7/026; G11; G11C; G11C19/00; G11C19/20; G11C19/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |