Patent US3345867A successfully refreshed from Google Patents.
US3345867A
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Method and apparatus for measuring rock bit wear while drilling
Assignee: ARPS CORP
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Filing: 1964-09-03
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Granted: 1967-10-10
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Expires: 1984-09-03
Abstract
No abstract record available.
Inventors
- 👤 Jan J Arps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:52
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE MEHTOD FOR DETERMINING WEAR OF THE ROTARY CUTTING CORE OF A ROTARY BIT CUTTING A BOREHOLE WHICH COMPRISES: DETECTING THE RATE OF ROTATION OF SAID BIT, DETECTING THE RATE OF ROTATION OF SAID CONE DURING THE CUTTING OPERATION INDEPENDENTLY OF THE RATE OF ROTATION OF THE BIT, TRANSMITTING A SIGNAL REPRESENTATIVE OF SAID RATE TO A COMPARING STATION, AND COMPARING AT SAID STATION THE RATE OF ROTATION OF THE BIT AND THE RATE OF ROTATION OF THE CORE TO DETERMINE THE DIAMETER OF THE CORE, AND COMPARING THE DETERMINED DIAMETER WITH A REFERENCE DIAMETER.
Claim 2
Dependent Claim
95 words
THE MEHTOD FOR DETERMINING WEAR OF THE ROTARY CUTTING CORE OF A ROTARY BIT CUTTING A BOREHOLE WHICH COMPRISES: DETECTING THE RATE OF ROTATION OF SAID BIT, DETECTING THE RATE OF ROTATION OF SAID CONE DURING THE CUTTING OPERATION INDEPENDENTLY OF THE RATE OF ROTATION OF THE BIT, TRANSMITTING A SIGNAL REPRESENTATIVE OF SAID RATE TO A COMPARING STATION, AND COMPARING AT SAID STATION THE RATE OF ROTATION OF THE BIT AND THE RATE OF ROTATION OF THE CORE TO DETERMINE THE DIAMETER OF THE CORE, AND COMPARING THE DETERMINED DIAMETER WITH A REFERENCE DIAMETER.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |