Patent US2798558A successfully refreshed from Google Patents.
US2798558A
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Well completion apparatus
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1955-01-10
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Granted: 1957-07-09
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Expires: 1975-01-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas B Mcculloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:45
CPC Classifications
E; E21; E21B; E21B41/00; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
APPARATUS FOR USE IN WELLS HAVING A CASING ARRANGED THEREIN AND A TUBING POSITIONED IN SAID CASING WITH ITS LOWER OPEN END AT A LEVEL ABOVE A PLURALITY OF PRODUCTIVE EARTH INTERVALS WHICH COMPRISES, PACKING MEANS ARRANGED ADJACENT THE LOWER END OF SAID TUBING ISOLATING THE ANNULUS BETWEEN THE CASING AND TUBING FROM THE PRODUCTIVE INTERVALS BELOW THE LOWER END OF SAID TUBING, ELONGATED CONDUIT MEANS EXTENDING THROUGH SAID PACKING MEANS ADAPTED TO COMMUNICATE FLUIDLY THE ANNULUS WITH SAID CASING BELOW THE PACKING MEANS, VALVE MEANS ARRANGED IN SAID ELONGATED CONDUIT MEANS OPENABLE BY PRESSURE IMPOSED THEREON TO OPEN UP FLUID COMMUNICATION BETWEEN THE ANNULUS AND THE CASING BELOW SAID PACKING MEANS, AND
Claim 2
Dependent Claim
113 words
APPARATUS FOR USE IN WELLS HAVING A CASING ARRANGED THEREIN AND A TUBING POSITIONED IN SAID CASING WITH ITS LOWER OPEN END AT A LEVEL ABOVE A PLURALITY OF PRODUCTIVE EARTH INTERVALS WHICH COMPRISES, PACKING MEANS ARRANGED ADJACENT THE LOWER END OF SAID TUBING ISOLATING THE ANNULUS BETWEEN THE CASING AND TUBING FROM THE PRODUCTIVE INTERVALS BELOW THE LOWER END OF SAID TUBING, ELONGATED CONDUIT MEANS EXTENDING THROUGH SAID PACKING MEANS ADAPTED TO COMMUNICATE FLUIDLY THE ANNULUS WITH SAID CASING BELOW THE PACKING MEANS, VALVE MEANS ARRANGED IN SAID ELONGATED CONDUIT MEANS OPENABLE BY PRESSURE IMPOSED THEREON TO OPEN UP FLUID COMMUNICATION BETWEEN THE ANNULUS AND THE CASING BELOW SAID PACKING MEANS, AND
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) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |