US2420174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary wing structure
Assignee: RTX Corp
•
Filing: 1942-10-31
•
Granted: 1947-05-06
•
Expires: 1962-10-31
Abstract
No abstract record available.
Inventors
- 👤 William E Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US998978A
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US1344640A
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US1789240A
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US1949785A
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FR737063A
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US1891681A
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GB387904A
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US2164678A
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US2123429A
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US2303707A
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US2329366A
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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) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |