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US3456983A
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Guide for a swordless coal plough
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1968-01-11
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Granted: 1969-07-22
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Expires: 1988-01-11
Abstract
No abstract record available.
Inventors
- 👤 Christoph Rassmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:03
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/08; E21C35/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3305269A
Cited
US3363946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |