Patent US2735646A successfully refreshed from Google Patents.
US2735646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well drilling turbine screen
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
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Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:49
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; Y; Y10; Y10S; Y10S415/00; Y10S415/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN AN OIL WELL DRILLING TURBINE, A CASING, A SHAFT MOUTED TO TURN IN THE CASING, SAID SHAFT HAVING A BORE THEREIN, COOPERATING TURBINE BLADES ON SAID SHAFT AND CASING, SAID SHAFT AND CASING HAVING A SPACE THEREBETWEEN ON ONE SIDE OF SAID TURBINE BLADES, MEANS BETWEEN THE CASING AND SHAFT CLOSING THE END OF SAID SPACE REMOTE FROM THE TURBINE BLADES, A SCREEN IN AN INTERMEDIATE PART OF SAID SPACE, SAID SHAFT HAVING AN OPENING THEREIN CONNECTING THE PART OF THE SPACE ON THE SIDE OF THE SCREEN REMOTE FROM THE TURBINE BLADES TO THE BORE, SAID CASING HAVING AN OPENING THERETHROUGH INTO THE PART OF THE SPACE ON THE SIDE OF SAID SCREEN NEAREST THE TURBINE BLADES, AND REMOVABLE MEANS FOR CLOSING SAID LAST OPENING.
Claim 2
Dependent Claim
127 words
IN AN OIL WELL DRILLING TURBINE, A CASING, A SHAFT MOUTED TO TURN IN THE CASING, SAID SHAFT HAVING A BORE THEREIN, COOPERATING TURBINE BLADES ON SAID SHAFT AND CASING, SAID SHAFT AND CASING HAVING A SPACE THEREBETWEEN ON ONE SIDE OF SAID TURBINE BLADES, MEANS BETWEEN THE CASING AND SHAFT CLOSING THE END OF SAID SPACE REMOTE FROM THE TURBINE BLADES, A SCREEN IN AN INTERMEDIATE PART OF SAID SPACE, SAID SHAFT HAVING AN OPENING THEREIN CONNECTING THE PART OF THE SPACE ON THE SIDE OF THE SCREEN REMOTE FROM THE TURBINE BLADES TO THE BORE, SAID CASING HAVING AN OPENING THERETHROUGH INTO THE PART OF THE SPACE ON THE SIDE OF SAID SCREEN NEAREST THE TURBINE BLADES, AND REMOVABLE MEANS FOR CLOSING SAID LAST OPENING.
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) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |