US3137484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Face conveyor having coal plough guide means
Assignee: Stamicarbon BV
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Filing: 1962-08-13
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Granted: 1964-06-16
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Expires: 1982-08-13
Abstract
No abstract record available.
Inventors
- 👤 Freerk J Fontein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/08; E21C35/12; B; B65; B65G; B65G19/00; B65G19/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A MINING FACE CONVEYOR HAVING SIDE WALLS AND A SLOPING WALL ADAPTED TO GUIDE A COAL PLOUGH MOUNTED ON THE SIDE WALL NEAREST THE COAL FACE, SAID SLOPING WALL EXTENDING UPWARDLY AND AWAY FROM THE COAL FACE TO A POSITION SUBSTANTIALLY ABOVE SAID ASSOCIATED SIDE WALL, AND GUIDE MEANS FOR THE COAL PLOUGH MOUNTED ON THE UPPER EDGE OF SAID SLOPING WALL.
Claim 2
Dependent Claim
62 words
A MINING FACE CONVEYOR HAVING SIDE WALLS AND A SLOPING WALL ADAPTED TO GUIDE A COAL PLOUGH MOUNTED ON THE SIDE WALL NEAREST THE COAL FACE, SAID SLOPING WALL EXTENDING UPWARDLY AND AWAY FROM THE COAL FACE TO A POSITION SUBSTANTIALLY ABOVE SAID ASSOCIATED SIDE WALL, AND GUIDE MEANS FOR THE COAL PLOUGH MOUNTED ON THE UPPER EDGE OF SAID SLOPING WALL.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |