Patent US3225844A successfully refreshed from Google Patents.
US3225844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bit weight applicator
Assignee: ExxonMobil Upstream Research Co
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Filing: 1961-05-05
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Granted: 1965-12-28
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Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
- 👤 Roberts Alan Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
E; E21; E21B; E21B44/00; E21B44/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A ROTARY DRILLING METHOD WHEREIN A STREAM OF DRILLING FLUID IS CIRCULATED THROUGH A STRING OF DRILL PIPE SUSPENDED IN A BOREHOLE AND A DRILL BIT IS SUPPORTED FROM THE STRING, THE IMPROVEMTN WHICH COMPRISES: ROTATING SAID BIT AND SAID STRING IN RIGID LONGITUDINAL RELATION, GENERATING A PRESSURE DIFFERENTIAL WITHIN THE CIRCULATING STREAM OF DRILLING FLUID IN THE VICINITY OF THE BIT, APPLYING A DOWNWARD EXIAL THRUST TO THE BIT FROM SAID DRILL STRING IN RESPONSE TO SAID PRESSURE DIFFERENTIAL, AND TRANSMITTING THE RESULTANT UPWARD REACTION THRUST FROM SAID DRILL STRING TO RESULTANT UPWARD REACTION THRUST FROM SAID DRILL STRING TO THE WALL OF THE BOREHOLE.
Claim 2
Dependent Claim
107 words
IN A ROTARY DRILLING METHOD WHEREIN A STREAM OF DRILLING FLUID IS CIRCULATED THROUGH A STRING OF DRILL PIPE SUSPENDED IN A BOREHOLE AND A DRILL BIT IS SUPPORTED FROM THE STRING, THE IMPROVEMTN WHICH COMPRISES: ROTATING SAID BIT AND SAID STRING IN RIGID LONGITUDINAL RELATION, GENERATING A PRESSURE DIFFERENTIAL WITHIN THE CIRCULATING STREAM OF DRILLING FLUID IN THE VICINITY OF THE BIT, APPLYING A DOWNWARD EXIAL THRUST TO THE BIT FROM SAID DRILL STRING IN RESPONSE TO SAID PRESSURE DIFFERENTIAL, AND TRANSMITTING THE RESULTANT UPWARD REACTION THRUST FROM SAID DRILL STRING TO RESULTANT UPWARD REACTION THRUST FROM SAID DRILL STRING TO THE WALL OF THE BOREHOLE.
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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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |