Patent US3138216A successfully refreshed from Google Patents.
US3138216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill rod
Assignee: Sandvik AB
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Filing: 1962-06-25
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Granted: 1964-06-23
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Heiskanen Sakari
- 👤 Dahlin Curt Vilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:43
CPC Classifications
E; E21; E21B; E21B17/00; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
DRILL ROD COMPRISING AN INTEGRAL SHANK FOR CONNECTING THE REAR END OF THE DRILL ROD TO THE SLEEVE OF A DRILLING MACHINE AND AN INTEGRAL COLLAR LIMITING THE FORWARD END OF SAID SHANK, THE MAJOR REAR END OF SAID SHANK HAVING A REGULAR POLYGONAL CROSS SECTION WITH PLANE SIDE SURFACES AND EDGES BETWEEN SAID SIDE SURFACES, SAID PLANE SIDE SURFACES EXTENDING FORWARDLY AND BEING CONNECTED TO THE REAR SURFACE OF SAID COLLAR BY CURVED SURFACES, THE MINOR FORWARD ENDS OF SAID EDGES BEING BEVELED AND THE BEVELED SURFACES ALSO BEING CONNECTED TO THE REAR SURFACE OF SAID COLLAR BY CURVED SURFACES, ALL POINTS OF SAID BEVELED SURFACES AND OF SAID CURVED SURFACES BEING AT LEAST AS REMOTE FROM THE AXIS OF SAID SHANK AS THE NEAREST POINT OF SAID PLANE SIDE SURFACES, SAID BEVELED SURFACES BEING CLOSER TO SAID AXIS THAN SAID EDGES AND THE AVERAGE WIDTH OF SAID BEVELED SURFACES BEING LESS THAN ONE THIRD OF THE WIDTH OF SAID PLANE SIDE SURFACES AT THE REAR END OF SAID SHANK.
Claim 2
Dependent Claim
171 words
DRILL ROD COMPRISING AN INTEGRAL SHANK FOR CONNECTING THE REAR END OF THE DRILL ROD TO THE SLEEVE OF A DRILLING MACHINE AND AN INTEGRAL COLLAR LIMITING THE FORWARD END OF SAID SHANK, THE MAJOR REAR END OF SAID SHANK HAVING A REGULAR POLYGONAL CROSS SECTION WITH PLANE SIDE SURFACES AND EDGES BETWEEN SAID SIDE SURFACES, SAID PLANE SIDE SURFACES EXTENDING FORWARDLY AND BEING CONNECTED TO THE REAR SURFACE OF SAID COLLAR BY CURVED SURFACES, THE MINOR FORWARD ENDS OF SAID EDGES BEING BEVELED AND THE BEVELED SURFACES ALSO BEING CONNECTED TO THE REAR SURFACE OF SAID COLLAR BY CURVED SURFACES, ALL POINTS OF SAID BEVELED SURFACES AND OF SAID CURVED SURFACES BEING AT LEAST AS REMOTE FROM THE AXIS OF SAID SHANK AS THE NEAREST POINT OF SAID PLANE SIDE SURFACES, SAID BEVELED SURFACES BEING CLOSER TO SAID AXIS THAN SAID EDGES AND THE AVERAGE WIDTH OF SAID BEVELED SURFACES BEING LESS THAN ONE THIRD OF THE WIDTH OF SAID PLANE SIDE SURFACES AT THE REAR END OF SAID SHANK.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |