US3107902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of supporting mine roofs and supporting means therefor
Assignee: Joy Manufacturing Co
•
Filing: 1958-12-29
•
Granted: 1963-10-22
•
Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 Alexander W Calder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:05
CPC Classifications
E; E21; E21D; E21D17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN COMBINATION, A MINING MACHINE FOR FORMING A PASSAGEWAY IN THE MINE VEIN OF AN UNDERGROUND MINE, A ROOF SUPPORTING MEANS MOUNTED ON SAID MINING MACHINE, SAID MEANS INCLUDING FLEXIBLE SUPPORTING ELEMENTS EXTENDABLE THEREFROM LONGITUDINALLY OF SUCH PASSAGEWAY AT THE ROOF THEREOF, SAID FLEXIBLE SUPPORTING ELEMENTS BE-
Claim 2
Dependent Claim
47 words
IN COMBINATION, A MINING MACHINE FOR FORMING A PASSAGEWAY IN THE MINE VEIN OF AN UNDERGROUND MINE, A ROOF SUPPORTING MEANS MOUNTED ON SAID MINING MACHINE, SAID MEANS INCLUDING FLEXIBLE SUPPORTING ELEMENTS EXTENDABLE THEREFROM LONGITUDINALLY OF SUCH PASSAGEWAY AT THE ROOF THEREOF, SAID FLEXIBLE SUPPORTING ELEMENTS BE-
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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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |