Patent US3200477A successfully refreshed from Google Patents.
US3200477A
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US
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Helicopter tail rotor structure and method of construction
Assignee: RJ Enstrom Corp
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Filing: 1962-11-21
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Granted: 1965-08-17
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Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 Paul L Shultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:10
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123144A
Cited
US1996850A
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US2183158A
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US2511858A
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US2596818A
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GB662110A
Cited
US2674377A
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US3045967A
Cited
US2884078A
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US2941603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |