US2981527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine having cutting and breaking rolls and suction transporting means
Assignee: Gelsenkirchener Bergwerks AG
•
Filing: 1958-10-21
•
Granted: 1961-04-25
•
Expires: 1978-10-21
Abstract
No abstract record available.
Inventors
- 👤 Kircher Alfred
- 👤 Siegelmann Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:35
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1148975A
Cited
US2606010A
Cited
US2592996A
Cited
GB688227A
Cited
FR1039292A
Cited
US2767970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |