US2740909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric differential transmission
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1953-06-09
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Granted: 1956-04-03
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Expires: 1973-06-09
Abstract
No abstract record available.
Inventors
- 👤 Walter R Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
H; H02; H02K; H02K51/00; G; G05; G05B; G05B11/00; G05B11/01; G05B11/012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE641208C
Cited
FR1266576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |