Patent US3102600A successfully refreshed from Google Patents.
US3102600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus for large well bores
Assignee: GAS DRILLING SERVICES CO
•
Filing: 1961-08-18
•
Granted: 1963-09-03
•
Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
- 👤 Jackson John Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:58
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/12; E21B21/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN DRILLING APPARATUS FOR DRILLING A BORE HOLE, IN COMBINATION: A DRILL STRING HAVING A HOLLOW INNER PIPE SERVING AS AN INLET FLUID PASSAGE, AND AN OUTER PIPE CONCENTRIC THEREWITH AND FORMING A FIRST ANNULUS WITH SAID INNER PIPE WHICH SERVES AS AN OUTLET PASSAGE FOR FLUID AND DRILLINGS; A BIT ATTACHED TO SAID DRILL STRING; AN OPEN-ENDED BASKET MOUNTED ON SAID DRILL STRING CONCENTRICALLY WITH SAID OUTER PIPE, WITH ITS OPEN END A RELATIVELY SHORT DISTANCE ABOVE SAID BIT, AND FORMING A SECOND ANNULUS WITH SAID OUTER PIPE, AND A THIRD ANNULUS WITH SAID BORE HOLE, SAID OUTER PIPE HAVING OPENINGS IN ITS SECTION SURROUNDED
Claim 2
Dependent Claim
106 words
IN DRILLING APPARATUS FOR DRILLING A BORE HOLE, IN COMBINATION: A DRILL STRING HAVING A HOLLOW INNER PIPE SERVING AS AN INLET FLUID PASSAGE, AND AN OUTER PIPE CONCENTRIC THEREWITH AND FORMING A FIRST ANNULUS WITH SAID INNER PIPE WHICH SERVES AS AN OUTLET PASSAGE FOR FLUID AND DRILLINGS; A BIT ATTACHED TO SAID DRILL STRING; AN OPEN-ENDED BASKET MOUNTED ON SAID DRILL STRING CONCENTRICALLY WITH SAID OUTER PIPE, WITH ITS OPEN END A RELATIVELY SHORT DISTANCE ABOVE SAID BIT, AND FORMING A SECOND ANNULUS WITH SAID OUTER PIPE, AND A THIRD ANNULUS WITH SAID BORE HOLE, SAID OUTER PIPE HAVING OPENINGS IN ITS SECTION SURROUNDED
References Cited (Backward Citations)
US2930586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-02 | 1967-03-04 | 1967-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-02 | 1971-03-04 | 1971-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-02 | 1975-03-04 | 1975-09-03 | $7700.00 | Window Closed / Lapsed |