Patent US5399158A successfully refreshed from Google Patents.
US3115774A
Expired / Lapsed
US
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Magnetostrictive drill string logging device
Assignee: Shell USA Inc
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Filing: 1960-06-27
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Granted: 1963-12-31
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Expires: 1980-06-27
Abstract
No abstract record available.
Inventors
- 👤 Robert H Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:10
CPC Classifications
E; E21; E21B; E21B44/00; E21B12/00; E21B12/02; E21B41/00; E21B41/0085; E21B47/00; E21B47/007; E21B49/00; E21B49/003; E21B49/006; Y; Y10; Y10S; Y10S73/00; Y10S73/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN APPARATUS FOR INDICATING THE HARDNESS OF AN EARTH FORMATION BEING DRILLED AND THE POSSIBLE OCCURRENCE OF A LOCKED CONE ON THE DRILLING BIT BY MEANS OF INFORMATION SIGNALS TRANSMITTED FROM THE BOTTOM OF A BOREHOLE AS STRESSES IN THE DRILL STRING DURING A DRILLING OPERATION COMPRISING: A ROTARY DRILLING RIG HAVING A ROTARY DRILLING TABLE AND A DRILL STRING EXHIBITING MAGNETOSTRICTIVE PROPERTIES; MEANS FOR PRODUCING A MAGNETIC FIELD IN SAID DRILL STRING; MEANS FOR DETECTING THE LONGITUDINAL STRESSES IN SAID DRILL STRING, SAID MEANS INCLUDING AN INDUCTIVE COIL DISPOSED AROUND A MAGNETOSTRICTIVE PORTION OF THE DRILL STRING ABOVE SAID ROTARY DRILLING TABLE TO GENERATE A SIGNAL RELATED TO THE CHANGES IN THE MAGNETIC FIELD IN SAID PORTION OF THE DRILL STRING; AND, MEANS COUPLED TO SAID INDUCTIVE COIL FOR INDICATING THE FLUCTUATIONS IN SAID GENERATED SIGNAL.
Claim 2
Independent Claim
137 words
AN APPARATUS FOR INDICATING THE HARDNESS OF AN EARTH FORMATION BEING DRILLED AND THE POSSIBLE OCCURRENCE OF A LOCKED CONE ON THE DRILLING BIT BY MEANS OF INFORMATION SIGNALS TRANSMITTED FROM THE BOTTOM OF A BOREHOLE AS STRESSES IN THE DRILL STRING DURING A DRILLING OPERATION COMPRISING: A ROTARY DRILLING RIG HAVING A ROTARY DRILLING TABLE AND A DRILL STRING EXHIBITING MAGNETOSTRICTIVE PROPERTIES; MEANS FOR PRODUCING A MAGNETIC FIELD IN SAID DRILL STRING; MEANS FOR DETECTING THE LONGITUDINAL STRESSES IN SAID DRILL STRING, SAID MEANS INCLUDING AN INDUCTIVE COIL DISPOSED AROUND A MAGNETOSTRICTIVE PORTION OF THE DRILL STRING ABOVE SAID ROTARY DRILLING TABLE TO GENERATE A SIGNAL RELATED TO THE CHANGES IN THE MAGNETIC FIELD IN SAID PORTION OF THE DRILL STRING; AND, MEANS COUPLED TO SAID INDUCTIVE COIL FOR INDICATING THE FLUCTUATIONS IN SAID GENERATED SIGNAL.
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) | 1966-12-30 | 1967-07-01 | 1967-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-30 | 1971-07-01 | 1971-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-30 | 1975-07-01 | 1975-12-31 | $7700.00 | Window Closed / Lapsed |