Patent US3023980A successfully refreshed from Google Patents.
US3023980A
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US
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Turbo-fan lift device
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1958-10-13
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Granted: 1962-03-06
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Expires: 1978-10-13
Abstract
No abstract record available.
Inventors
- 👤 Cecil G Martin
- 👤 Robert L Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:42
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/02; B64C39/026; F; F02; F02C; F02C3/00; F02C3/04; F02C3/08; F02C3/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1742461A
Cited
US2509603A
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US2596378A
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US2640549A
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US2568813A
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US2461347A
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US2630676A
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US2801058A
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US2592938A
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US2709889A
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US2912188A
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US2920841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |