US3231029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articulated drilling shafts for raise drilling
Assignee: JAMES S ROBBINS AND ASSOCIATES Inc
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Filing: 1963-10-28
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Granted: 1966-01-25
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Expires: 1983-10-28
Abstract
No abstract record available.
Inventors
- 👤 Douglas F Winberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:22
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28; E21B17/00; E21B17/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A DRILLING SHAFT FOR USE IN A RAISE DRILLING OPERATION WHEREIN A RAISE HOLE IN DRILLED UPWARDLY FROM A LOWER LEVEL TO AN UPPER LEVEL ALONG THE PATH OF PREVIOUSLY DRILLED PILOT HOLE, SAID DRILLING SHAFT COMPRISING: A DRLL STEM SITUATED IN A PILOT HOLE AND HAVING A RELATIVELY RIGID UPPER PORTION, A RELATIVELY RIGID LOWER PORTION, A UNIVERSAL JOINT INTERCONNECTING SAID UPPER PORTION WITH SAID LOWER PORTION, AND STABILIZER MEANS ON SAID UPPER PORTION, SAID
Claim 2
Dependent Claim
76 words
A DRILLING SHAFT FOR USE IN A RAISE DRILLING OPERATION WHEREIN A RAISE HOLE IN DRILLED UPWARDLY FROM A LOWER LEVEL TO AN UPPER LEVEL ALONG THE PATH OF PREVIOUSLY DRILLED PILOT HOLE, SAID DRILLING SHAFT COMPRISING: A DRLL STEM SITUATED IN A PILOT HOLE AND HAVING A RELATIVELY RIGID UPPER PORTION, A RELATIVELY RIGID LOWER PORTION, A UNIVERSAL JOINT INTERCONNECTING SAID UPPER PORTION WITH SAID LOWER PORTION, AND STABILIZER MEANS ON SAID UPPER PORTION, SAID
References Cited (Backward Citations)
US636758A
Cited
FR342997A
Cited
US855106A
Cited
US2694549A
Cited
US2930586A
Cited
US2823900A
Cited
DE1150035B
Cited
GB939653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |