US2841328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital differential analyzer
Assignee: Northrop Grumman Corp
•
Filing: 1950-03-06
•
Granted: 1958-07-01
•
Expires: 1970-03-06
Abstract
No abstract record available.
Inventors
- 👤 Floyd G Steele
- 👤 Richard E Sprague
- 👤 Bernard T Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:40
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)
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US2429228A
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US2540551A
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US2604262A
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US2623171A
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US2623115A
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US2672284A
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US2719670A
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US2533242A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |