Patent US2987420A successfully refreshed from Google Patents.
US2126751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodynamic brake
Assignee: Parkersburg Rig and Reel Co
•
Filing: 1936-01-28
•
Granted: 1938-08-16
•
Expires: 1956-01-28
Abstract
No abstract record available.
Inventors
- 👤 Mater Robert Griffin De La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:28
CPC Classifications
F; F16; F16D; F16D57/00; F16D57/005; F16D57/04
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) | 1941-08-15 | 1942-02-14 | 1942-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-15 | 1946-02-14 | 1946-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-15 | 1950-02-14 | 1950-08-16 | $7700.00 | Window Closed / Lapsed |