Patent US2887391A successfully refreshed from Google Patents.
Patent US242634A successfully refreshed from Google Patents.
Patent US2663169A successfully refreshed from Google Patents.
Patent US3436301A successfully refreshed from Google Patents.
Patent US2309899A successfully refreshed from Google Patents.
US2309899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable pitch propeller
Assignee: Individual
•
Filing: 1941-02-17
•
Granted: 1943-02-02
•
Expires: 1961-02-17
Abstract
No abstract record available.
Inventors
- 👤 Hepperle Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:58
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/02; B63H3/04; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1946-02-01 | 1946-08-03 | 1947-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-02-01 | 1950-08-03 | 1951-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-02-01 | 1954-08-03 | 1955-02-02 | $7700.00 | Window Closed / Lapsed |