US3268258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveying and roof bolting method and apparatus
Assignee: Jones and Laughlin Steel Corp
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Filing: 1962-09-21
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Granted: 1966-08-23
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Expires: 1982-09-21
Abstract
No abstract record available.
Inventors
- 👤 William G Kegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:15
CPC Classifications
E; E21; E21D; E21D20/00; E21D20/003
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
THE METHOD OF DRIVING A CONTINUOUSLY ADVANCING MINE FACE AND INTERMITTENTLY PROVIDING ROOF SUPPORT IMMEDIATELY BEHIND THE FACE COMPRISING CUTTING AND DISCHARGING MATERIAL FROM THE MINE IN A CONTINUOUSLY ADVANCING OPERATION, TRANSFERRING THE MINED MATERIAL TO A CONTINUOUSLY ADVANCING FIRST CONVEYOR, CONTINUOUSLY DISCHARGING THE MINED MATERIAL FROM THE FIRST CONVEYOR ONTO A SECOND MOVABLE CONVEYOR, HALTING THE SECOND CONVEYOR AND PERFORMING A ROOF DRILLING AND BOLTING OPERATION THEREFROM WITH OUT INTERRUPTING THE DISCHARGE OF MATERIAL THEREON FROM THE FIRST CONVEYOR, AND THEN ADVANCING THE SECOND CONVEYOR TOWARD THE MINE FACE.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |