US2689934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induced-current brake traction drive control
Assignee: Harnischfeger Corp
•
Filing: 1949-05-27
•
Granted: 1954-09-21
•
Expires: 1969-05-27
Abstract
No abstract record available.
Inventors
- 👤 Frank W Wendelburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C13/22; B66C13/30; B66C2700/00; B66C2700/08; B66C2700/082
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1439174A
Cited
US1812951A
Cited
US1828308A
Cited
US2096473A
Cited
US2139772A
Cited
US2151734A
Cited
US2420595A
Cited
US2437996A
Cited
US2493607A
Cited
US2548178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |