Patent US2920451A successfully refreshed from Google Patents.
US2920451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratio changer
Assignee: Wagner Electric Corp
•
Filing: 1955-06-06
•
Granted: 1960-01-12
•
Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur N Milster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:48
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB444955A
Cited
US2144020A
Cited
US2207173A
Cited
US2218194A
Cited
US2340462A
Cited
US2526968A
Cited
US2463173A
Cited
FR1055956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |