Patent US2312891A successfully refreshed from Google Patents.
US2312891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodynamic machine
Assignee: Oilgear Co
•
Filing: 1939-05-19
•
Granted: 1943-03-02
•
Expires: 1959-05-19
Abstract
No abstract record available.
Inventors
- 👤 Ferris Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:04
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0003; F04C15/0023
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) | 1946-03-01 | 1946-08-31 | 1947-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-03-01 | 1950-08-31 | 1951-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-03-01 | 1954-08-31 | 1955-03-02 | $7700.00 | Window Closed / Lapsed |