Patent US4675787A successfully refreshed from Google Patents.
US3145784A
Expired / Lapsed
US
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Undergage hole indicator
Assignee: Shell USA Inc
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Filing: 1961-12-22
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Granted: 1964-08-25
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Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 Wilfred S Crake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:22
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
AN UNDERGAGE HOLE INDICATOR FOR USE IN COMBINATION WITH A DRILL STRING HAVING A BIT AT THE LOWER END THEREOF AND A BORE THROUGH WHICH FLUID IS CONVEYED TO SAID BIT, SAID INDICATOR COMPRISING, A HOUSING SECURED TO AND INTERPOSED BETWEEN SAID DRILL STRING AND SAID BIT AND HAVING AXIALLY EXTENDING DUCT MEANS THEREIN THROUGH WHICH DRILLING FLUID IS CONVEYED FROM THE DRILL STRING TO THE BIT, SAID HOUSING HAVING PASSAGE MEANS EXTENDING BETWEEN THE DUCT MEANS AND THE PERIPHERY OF THE HOUSING; SEALING MEANS DISPOSED IN SAID PASSAGE MEANS AT THE PERIPHERY OF THE HOUSING, SAID SEALING MEANS HAVING THE OUTER EXTREMITY THEREOF SPACED FROM THE LONGITUDINAL CENTER LINE OF SAID HOUSING BY A DISTANCE SUBSTANTIALLY EQUAL TO THE CUTTING RADIUS OF THE BIT AND WHEREIN SAID SEALING MEANS IS ADAPTED TO OPEN UPON CONTACT OF SAID OUTER EXTREMITY WITH THE WALLS OF A HOLE INTO WHICH THE DRILL STRING IS BEING LOWERED; AND VALVE MEANS DISPOSED IN SAID PASSAGE MEANS TO PREVENT FLOW THERETHROUGH WHEN THE SEALING MEANS IS CLOSED, SAID VALVE MEANS BEING ADAPTED TO ADMIT FLOW THROUGH SAID PASSAGE MEANS UPON OPENING OF THE SEALING MEANS.
Claim 2
Dependent Claim
190 words
AN UNDERGAGE HOLE INDICATOR FOR USE IN COMBINATION WITH A DRILL STRING HAVING A BIT AT THE LOWER END THEREOF AND A BORE THROUGH WHICH FLUID IS CONVEYED TO SAID BIT, SAID INDICATOR COMPRISING, A HOUSING SECURED TO AND INTERPOSED BETWEEN SAID DRILL STRING AND SAID BIT AND HAVING AXIALLY EXTENDING DUCT MEANS THEREIN THROUGH WHICH DRILLING FLUID IS CONVEYED FROM THE DRILL STRING TO THE BIT, SAID HOUSING HAVING PASSAGE MEANS EXTENDING BETWEEN THE DUCT MEANS AND THE PERIPHERY OF THE HOUSING; SEALING MEANS DISPOSED IN SAID PASSAGE MEANS AT THE PERIPHERY OF THE HOUSING, SAID SEALING MEANS HAVING THE OUTER EXTREMITY THEREOF SPACED FROM THE LONGITUDINAL CENTER LINE OF SAID HOUSING BY A DISTANCE SUBSTANTIALLY EQUAL TO THE CUTTING RADIUS OF THE BIT AND WHEREIN SAID SEALING MEANS IS ADAPTED TO OPEN UPON CONTACT OF SAID OUTER EXTREMITY WITH THE WALLS OF A HOLE INTO WHICH THE DRILL STRING IS BEING LOWERED; AND VALVE MEANS DISPOSED IN SAID PASSAGE MEANS TO PREVENT FLOW THERETHROUGH WHEN THE SEALING MEANS IS CLOSED, SAID VALVE MEANS BEING ADAPTED TO ADMIT FLOW THROUGH SAID PASSAGE MEANS UPON OPENING OF THE SEALING MEANS.
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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |