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US2788075A
Expired / Lapsed
US
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Helicopter with paddle wheel type tail rotor
Assignee: Autogiro Company of America
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Filing: 1952-01-29
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Granted: 1957-04-09
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Expires: 1972-01-29
Abstract
No abstract record available.
Inventors
- 👤 Pullin Cyril George
- 👤 Shapiro Jacob Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:48
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82; B64C2027/8218; B64C2027/8236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1922606A
Cited
US2317340A
Cited
FR880360A
Cited
US2440225A
Cited
US2381417A
Cited
US2456942A
Cited
US2420784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |