US3167137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weighted drill collar
Assignee: Texaco Inc
•
Filing: 1961-12-19
•
Granted: 1965-01-26
•
Expires: 1981-12-19
Abstract
No abstract record available.
Inventors
- 👤 Howard C Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:05
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN COMBINATION, IN A DRILL COLLAR OF COMPOSITE CONSTRUCTION SUBJECT TO ROTATION, END SECTIONS AND INNER AND OUTER PIPE MEMBERS JOINED THERETO IN CONCENTRICALLY SPACED RELATIONSHIP TO EACH OTHER THREREBY DEFINING AN ANNULAR CHAMBER THEREWITH, SAID DRILL COLLAR BEING ADAPTED TO BE ATTACHED TO A ROTATABLE DRILL PIPE STRING HAVING THE SAME OUTER DIAMETRICAL DIMENSION, EACH OF SAID SECTIONS HAVING THE SAME OUTER DIAMETRICAL DIMENSION AS THE OUTER PIPE MEMBER AND HAVING A PASSAGEWAY IN COAXIAL COMMUNICATION WITH AND WITH A DIAMETER EQUAL TO THE INNER DIAMETER OF THE INNER PIPE MEMBER, A METALLIC MATERIAL COMPLETELY OCCUPYING SAID ANNULAR CHAMBER AND HAVING A HIGHER SPECIFIC GRAVITY THAN SAID PIPE MEMBERS AND SAID END SECTIONS TO PROVIDE A DRILL COLAR OF SUBSTANTIALLY THE
Claim 2
Dependent Claim
122 words
IN COMBINATION, IN A DRILL COLLAR OF COMPOSITE CONSTRUCTION SUBJECT TO ROTATION, END SECTIONS AND INNER AND OUTER PIPE MEMBERS JOINED THERETO IN CONCENTRICALLY SPACED RELATIONSHIP TO EACH OTHER THREREBY DEFINING AN ANNULAR CHAMBER THEREWITH, SAID DRILL COLLAR BEING ADAPTED TO BE ATTACHED TO A ROTATABLE DRILL PIPE STRING HAVING THE SAME OUTER DIAMETRICAL DIMENSION, EACH OF SAID SECTIONS HAVING THE SAME OUTER DIAMETRICAL DIMENSION AS THE OUTER PIPE MEMBER AND HAVING A PASSAGEWAY IN COAXIAL COMMUNICATION WITH AND WITH A DIAMETER EQUAL TO THE INNER DIAMETER OF THE INNER PIPE MEMBER, A METALLIC MATERIAL COMPLETELY OCCUPYING SAID ANNULAR CHAMBER AND HAVING A HIGHER SPECIFIC GRAVITY THAN SAID PIPE MEMBERS AND SAID END SECTIONS TO PROVIDE A DRILL COLAR OF SUBSTANTIALLY THE
References Cited (Backward Citations)
US513892A
Cited
US1485512A
Cited
US2126075A
Cited
US2100419A
Cited
US2555628A
Cited
US2776816A
Cited
US2928411A
Cited
US2958512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-26 | 1968-07-27 | 1969-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-26 | 1972-07-27 | 1973-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-26 | 1976-07-27 | 1977-01-26 | $7700.00 | Window Closed / Lapsed |