Patent US3101784A successfully refreshed from Google Patents.
US3101784A
Expired / Lapsed
US
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Rotary wash screen setting combination and rotary washing tool therefor
Assignee: Howard Smith Co
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Filing: 1961-10-16
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Granted: 1963-08-27
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Edward E Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:49
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN COMBINATION, A WELL SCREEN, A WASH PIPE EXTENDING THROUGH SAID SCREEN FOR CONDUCTING WASHING FLUID THROUGH SAID SCREEN FROM ONE END TO THE OTHER THEREOF, A CHECK VALVE CLOSING ONE END OF SAID SCREEN AND RELEASABLY AND SEALINGLY ENGAGING ONE END OF SAID WASH PIPE TO RECEIVE WASHING FLUID THEREFROM, AND ARRANGED TO PERMIT FLOW FROM SAID WASH PIPE THROUGH SAID CHECK VALVE AND PREVENT FLOW IN THE OPPOSITE DIRECTION, AND A ROTARY WASHING TOOL COMPRISING A ROTARY BIT AND MEANS ROTATABLY CON-
Claim 2
Dependent Claim
84 words
IN COMBINATION, A WELL SCREEN, A WASH PIPE EXTENDING THROUGH SAID SCREEN FOR CONDUCTING WASHING FLUID THROUGH SAID SCREEN FROM ONE END TO THE OTHER THEREOF, A CHECK VALVE CLOSING ONE END OF SAID SCREEN AND RELEASABLY AND SEALINGLY ENGAGING ONE END OF SAID WASH PIPE TO RECEIVE WASHING FLUID THEREFROM, AND ARRANGED TO PERMIT FLOW FROM SAID WASH PIPE THROUGH SAID CHECK VALVE AND PREVENT FLOW IN THE OPPOSITE DIRECTION, AND A ROTARY WASHING TOOL COMPRISING A ROTARY BIT AND MEANS ROTATABLY CON-
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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) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |