US2781970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog computer
Assignee: Shell Development Co
•
Filing: 1951-10-08
•
Granted: 1957-02-19
•
Expires: 1971-10-08
Abstract
No abstract record available.
Inventors
- 👤 Kaufman Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:06
CPC Classifications
H; H03; H03M; H03M1/00; G; G06; G06J; G06J1/00; H03M1/06; H03M1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2156061A
Cited
US2313666A
Cited
US2477395A
Cited
US2468150A
Cited
US2567532A
Cited
US2601403A
Cited
US2616965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |