Patent US3239275A successfully refreshed from Google Patents.
US3239275A
Expired / Lapsed
US
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Mining pick
Assignee: Charbonnages de France CDF
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Filing: 1962-04-11
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Granted: 1966-03-08
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Expires: 1982-04-11
Abstract
No abstract record available.
Inventors
- 👤 Belugou Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:27
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/183; E21C35/1837
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
AN IMPROVED MINING PICK COMPRISING A PICK BODY AND AN INSERT AT THE TIP OF SAID BODY HAVING A WORKING PORTION, SAID PICK HAVING A FRONT FACE EXTENDING TRANSVERSELY OF THE DIRECTION OF MOVEMENT OF SAID PICK AND BEING THAT FACE WHICH IS IN ADVANCE OF SUBSTANTIALLY THE ENTIRE PICK, SAID PICK HAVING A RELIEF FACE EXTENDING TRANSVERSELY OF THE DIRECTION OF MOVEMENT OF THE PICK AND BEING THAT FACE WHICH IS REARWARDLY OF SUBSTANTIALLY THE ENTIRE PICK, SAID FRONT AND REAR FACES CONVERGING TOWARDS THE WORKING PORTION OF SAID PICK INSERT, SAID PICK BODY AND INSERT HAVING A COUPLING SURFACE THEREBETWEEN, A BRAZED JOINT BETWEEN SAID INSERT AND PICK BODY AT SAID COUPLING SURFACE, SAID COUPLING SURFACE BEING A PORTION OF SUBSTANTIALLY A CYLINDER OF REVOLUTION CENTERED APPROXIMATELY ON AN AXIS THROUGH WHICH SAID FACES WOULD PASS IF EXTENDED TO CONVERGENCE.
Claim 2
Dependent Claim
142 words
AN IMPROVED MINING PICK COMPRISING A PICK BODY AND AN INSERT AT THE TIP OF SAID BODY HAVING A WORKING PORTION, SAID PICK HAVING A FRONT FACE EXTENDING TRANSVERSELY OF THE DIRECTION OF MOVEMENT OF SAID PICK AND BEING THAT FACE WHICH IS IN ADVANCE OF SUBSTANTIALLY THE ENTIRE PICK, SAID PICK HAVING A RELIEF FACE EXTENDING TRANSVERSELY OF THE DIRECTION OF MOVEMENT OF THE PICK AND BEING THAT FACE WHICH IS REARWARDLY OF SUBSTANTIALLY THE ENTIRE PICK, SAID FRONT AND REAR FACES CONVERGING TOWARDS THE WORKING PORTION OF SAID PICK INSERT, SAID PICK BODY AND INSERT HAVING A COUPLING SURFACE THEREBETWEEN, A BRAZED JOINT BETWEEN SAID INSERT AND PICK BODY AT SAID COUPLING SURFACE, SAID COUPLING SURFACE BEING A PORTION OF SUBSTANTIALLY A CYLINDER OF REVOLUTION CENTERED APPROXIMATELY ON AN AXIS THROUGH WHICH SAID FACES WOULD PASS IF EXTENDED TO CONVERGENCE.
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |