US2900134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital differential analyzer
Assignee: Northrop Grumman Corp
•
Filing: 1951-03-26
•
Granted: 1959-08-18
•
Expires: 1971-03-26
Abstract
No abstract record available.
Inventors
- 👤 Floyd G Steele
- 👤 William F Collison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:10
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/60; G06F7/64; G06F7/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2540654A
Cited
US2737342A
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US2564403A
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US2701095A
Cited
US2776794A
Cited
US2785855A
Cited
US2749037A
Cited
US2614169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |