US3445139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Longwall mining machine with cutting elements on rotated and reciprocated screw conveyor
Assignee: Individual
•
Filing: 1967-06-26
•
Granted: 1969-05-20
•
Expires: 1987-06-26
Abstract
No abstract record available.
Inventors
- 👤 Hans Joachim Von Hippel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:22
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/08; E21C35/12; E21C35/14; E21C25/00; E21C25/06; E21C25/14; E21C27/00; E21C27/20; E21C27/24; E21C33/00; E21C41/00; E21C41/16; E21C41/18
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |