US2429646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter
Assignee: Individual
•
Filing: 1943-04-22
•
Granted: 1947-10-28
•
Expires: 1963-04-22
Abstract
No abstract record available.
Inventors
- 👤 Pullin Cyril George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:11
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1669758A
Cited
US1722489A
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US1848389A
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US1959697A
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US1982968A
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US2023105A
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US1919142A
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US1982969A
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US2030578A
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US2041789A
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US2041796A
Cited
FR816504A
Cited
GB476596A
Cited
FR838828A
Cited
US2256635A
Cited
US2356692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |