US2620882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter with jet-propelled rotor
Assignee: Individual
•
Filing: 1947-08-01
•
Granted: 1952-12-09
•
Expires: 1967-08-01
Abstract
No abstract record available.
Inventors
- 👤 Morain Paul Henri Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:44
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL47909C
Cited
FR423590A
Cited
GB227151A
Cited
US1820946A
Cited
DE554906C
Cited
GB439805A
Cited
US2142601A
Cited
US2084464A
Cited
US2330056A
Cited
FR865452A
Cited
US2397357A
Cited
US2438151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |