Patent US3190380A successfully refreshed from Google Patents.
US3190380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling tool and method of making the same
Assignee: Gardner Denver Inc
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Filing: 1960-09-02
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Granted: 1965-06-22
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Expires: 1980-09-02
Abstract
No abstract record available.
Inventors
- 👤 Floyd R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
IN A DRILL ROD: AN ELONGATED METAL SHAFT HAVING AN ENLARGED EXTENSION, SAID EXTENSION AT ONE END HAVING A SLOT OPENING TO SAID END AND EXTENDING THEREINTO; A WORKCUTTING ELEMENT DISPOSED IN SAID SLOT AND JOINED TO SAID EXTENSION BY A LAYER OF CONNECTING METAL: SAID ROD COMPRISING FIRST, SECOND, AND THIRD LONGITUDINAL SEGMENTS HAVING DIFFERING DEGREE OF HARDNESS AND STRENGTH; SAID FIRST SEGMENT INCLUDING SAID SHAFT AND BEING OF HIGHEST HARDNESS AN STRENGTH ; SAID SECOND SEGMENT LOCATED INTERMEDIATE THE ENDS OF SAID EXTENSION AND BEING OF LOWEST HARDNESS AND STRENGTH; AND, SAID THIRD SEGMENT ENTIRELY SURROUNDINNG SAID SLOT BEING OF INTERMEDIATE HARDNESS AND STRENGTH.
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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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |