Patent US1449129A successfully refreshed from Google Patents.
US1449129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw propeller of helicopter flying machines
Assignee: Individual
•
Filing: 1920-07-17
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Granted: 1923-03-20
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Expires: 1940-07-17
Abstract
No abstract record available.
Inventors
- 👤 Pescara Raul Pateras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:19
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/08; B64C27/10; B64C27/54; B64C27/58; B64C27/59; B64C27/615; Y; Y02; Y02T; Y02T50/00; Y02T50/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1926-03-19 | 1926-09-18 | 1927-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-03-19 | 1930-09-18 | 1931-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-03-19 | 1934-09-18 | 1935-03-20 | $7700.00 | Window Closed / Lapsed |