US3357744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal planer having energy storing means to relatively drive cutting elements
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1965-09-08
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Granted: 1967-12-12
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Expires: 1985-09-08
Abstract
No abstract record available.
Inventors
- 👤 Heyer Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:03
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/32; E21C27/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |