US3380179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control of swing speed for dredges
Assignee: Ellicott Machine Corp
•
Filing: 1967-03-20
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Granted: 1968-04-30
•
Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Fred J Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:53
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3125819A
Cited
US934031A
Cited
US1842537A
Cited
US2644400A
Cited
US2661550A
Cited
US2889779A
Cited
US3111778A
Cited
US3224121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |