US3360960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical grooved tubular drill string
Assignee: Houston Oil Field Material Co Inc
•
Filing: 1966-02-16
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Granted: 1968-01-02
•
Expires: 1986-02-16
Abstract
No abstract record available.
Inventors
- 👤 Dulas L Massey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:33
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/22; E21B17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN AN ELONGATE TUBULAR MEMBER ADAPTED TO BE CONNECTED IN A DRILL STRING AND HAVING AT LEAST ONE HELICAL GROOVE IN THE OUTER PERIPHERAL SURFACE OF THE MEMBER, THE IMPROVEMENT IN SAID GROOVE COMPRISING, SAID GROOVE IN SECTION TRANSVERSELY OF THE GROOVE BEING A SERIES OF CONNECTED STEPS STARTING INWARDLY AT THE LEADING EDGE OF THE GROOVE IN THE DIRECTION OF DRILL STRING ROTATION, EACH STEP HAVING TWO LEGS, THE FIRST LEG OF EACH STEP EXTENDING INWARDLY AND THE SECOND LEG BEING SUBSTANTIALLY PERPENDICULAR TO THE FIRST LEG.
Claim 2
Dependent Claim
88 words
IN AN ELONGATE TUBULAR MEMBER ADAPTED TO BE CONNECTED IN A DRILL STRING AND HAVING AT LEAST ONE HELICAL GROOVE IN THE OUTER PERIPHERAL SURFACE OF THE MEMBER, THE IMPROVEMENT IN SAID GROOVE COMPRISING, SAID GROOVE IN SECTION TRANSVERSELY OF THE GROOVE BEING A SERIES OF CONNECTED STEPS STARTING INWARDLY AT THE LEADING EDGE OF THE GROOVE IN THE DIRECTION OF DRILL STRING ROTATION, EACH STEP HAVING TWO LEGS, THE FIRST LEG OF EACH STEP EXTENDING INWARDLY AND THE SECOND LEG BEING SUBSTANTIALLY PERPENDICULAR TO THE FIRST LEG.
References Cited (Backward Citations)
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Cited
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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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |