US2032255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller
Assignee: RTX Corp
•
Filing: 1933-02-13
•
Granted: 1936-02-25
•
Expires: 1953-02-13
Abstract
No abstract record available.
Inventors
- 👤 Frank W Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:46
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36; F04D29/362; B; B63; B63H; B63H3/00; B63H3/12; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/34; B64C11/38; B64C11/42; B64C11/44
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) | 1939-02-24 | 1939-08-26 | 1940-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-24 | 1943-08-26 | 1944-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-24 | 1947-08-26 | 1948-02-25 | $7700.00 | Window Closed / Lapsed |