US2868526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining equipment having cutting rotors adaptable to varying conditions
Assignee: Bituminous Coal Research Inc
•
Filing: 1951-05-22
•
Granted: 1959-01-13
•
Expires: 1971-05-22
Abstract
No abstract record available.
Inventors
- 👤 Will B Jamison
- 👤 Bloddie L Derringe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:21
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/10; E21C27/12; E21C27/124
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |