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Patent US2827967A successfully refreshed from Google Patents.
US2827967A
Expired / Lapsed
US
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Helicopter rotor blade
Assignee: KONINK NL VLIEGTUIGENFABRIEK F
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Filing: 1955-05-13
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Granted: 1958-03-25
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Expires: 1975-05-13
Abstract
No abstract record available.
Inventors
- 👤 Robert J Schliekelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:03
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0025; B29D99/0028; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2155375A
Cited
US2362301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |