US3431950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill collars
Assignee: Shell USA Inc
•
Filing: 1966-08-22
•
Granted: 1969-03-11
•
Expires: 1986-08-22
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Malott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:39
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A SECTION OF PIPE FOR USE IN A WELL DRILLING STRING, SAID SECTION COMPRISING: A LONGITUDINALLY EXTENDING TUBULAR WALL HAVING AN OUTER PERIPHERY AND AN INNER BORE; A PLURALITY OF CONDUIT MEANS EXTENDING SUBSTANTIALLY TRANSVERSELY ACROSS AND ENTIRELY WITHIN SAID TUBULAR WALL, EACH OF SAID CONDUIT MEANS HAVING OPPOSITE TERMINAL ENDS THAT ARE COMMUNICATIVE WITH SAID OUTER PERIPHERY; EACH OF SAID CONDUIT MEANS BEING SEALED FROM COMMUNICATION WITH SAID BORE.
Claim 2
Dependent Claim
70 words
A SECTION OF PIPE FOR USE IN A WELL DRILLING STRING, SAID SECTION COMPRISING: A LONGITUDINALLY EXTENDING TUBULAR WALL HAVING AN OUTER PERIPHERY AND AN INNER BORE; A PLURALITY OF CONDUIT MEANS EXTENDING SUBSTANTIALLY TRANSVERSELY ACROSS AND ENTIRELY WITHIN SAID TUBULAR WALL, EACH OF SAID CONDUIT MEANS HAVING OPPOSITE TERMINAL ENDS THAT ARE COMMUNICATIVE WITH SAID OUTER PERIPHERY; EACH OF SAID CONDUIT MEANS BEING SEALED FROM COMMUNICATION WITH SAID BORE.
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) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |