US3356418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal-cutter pick with hard metal tip and method of making
Assignee: Tungsten Carbide Developments Ltd
•
Filing: 1965-12-30
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Granted: 1967-12-05
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Expires: 1985-12-30
Abstract
No abstract record available.
Inventors
- 👤 John R Healey
- 👤 Francis E Hoole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:41
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/183; B; B23; B23K; B23K31/00; B23K31/02; B23K31/025; E21C35/1831; E21C35/1837
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A METHOD OF SECURING A PLUG-LIKE HARD METAL TIP IN A BORE A COAL-CUTTER PICK COMPRISES USING A TIP HAVING A SHOULDERED ENLARGEMENT AT THE END REMOTE FROM THE OPERATIVE END, FITTING THE TIP INTO A BORED NOSE OF TOOL STEEL HAVING A BORE TO FIT ACCUREATELY THE LENGTH OF THE TIP UP TO THE SHOULDER AND A COUNTERBORE THE END OF WHICH FITS THE SHOULDER ACCURATELY, AND BUTT-WELDING THE NOSE TO A TOOL STEEL BODY, PRESSURE APPLIED IN THE LENGTHWISE DIRECTION OF THE TIP SO AS TO LEAVE THE SHOULDER OF THE TIP HELD TO THE END OF THE COUNTERBORE BY METALLIC PRESSURE MAINTAINED ON THE END FACE OF THE SHOULDERED END WHEN THE WELD HAS BEEN COMPLETED.
Claim 2
Independent Claim
119 words
A METHOD OF SECURING A PLUG-LIKE HARD METAL TIP IN A BORE A COAL-CUTTER PICK COMPRISES USING A TIP HAVING A SHOULDERED ENLARGEMENT AT THE END REMOTE FROM THE OPERATIVE END, FITTING THE TIP INTO A BORED NOSE OF TOOL STEEL HAVING A BORE TO FIT ACCUREATELY THE LENGTH OF THE TIP UP TO THE SHOULDER AND A COUNTERBORE THE END OF WHICH FITS THE SHOULDER ACCURATELY, AND BUTT-WELDING THE NOSE TO A TOOL STEEL BODY, PRESSURE APPLIED IN THE LENGTHWISE DIRECTION OF THE TIP SO AS TO LEAVE THE SHOULDER OF THE TIP HELD TO THE END OF THE COUNTERBORE BY METALLIC PRESSURE MAINTAINED ON THE END FACE OF THE SHOULDERED END WHEN THE WELD HAS BEEN COMPLETED.
Claim 3
Dependent Claim
28 words
A COAL-CUTTER PICK COMPRISING A HARD METAL TIP HAVING A SHOULDERED ENLARGEMENT AT THE END, REMOTE FROM THE OPERATIVE END, A TOOL NOSE HAVING A ABORE FITTING AC-
Claim 4
Dependent Claim
28 words
A COAL-CUTTER PICK COMPRISING A HARD METAL TIP HAVING A SHOULDERED ENLARGEMENT AT THE END, REMOTE FROM THE OPERATIVE END, A TOOL NOSE HAVING A ABORE FITTING AC-
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |