US3245471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Setting casing in wells
Assignee: Pan American Petroleum Corp
•
Filing: 1963-04-15
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Granted: 1966-04-12
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Expires: 1983-04-15
Abstract
No abstract record available.
Inventors
- 👤 George C Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:01
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10; E21B43/101; E21B43/103; E21B43/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN A METHOD FOR CASING A WELL IN WHICH METHOD AN INNER STRING OF CASING IS RUN INSIDE AN OUTER STRING OF CASING AND A SEAL IS FORMED BETWEEN THE STRINGS AT THE TOP OF THE WELL, THE IMPROVEMENT COMPRISING INCLUDING A LONGITUDINALLY CORRUGATED MALLEABLE METALLIC SECTION NEAR THE TOP OF SAID INNER STRING AT A LOCATION WITHIN SAID OUTER STRING, THE WALL THICKNESS OF SAID OUTER STRING, OPPOSITE SAID CORRUGATED SECTION, TIMES THE MAXIMUM TENSILE STRENGTH OF THE MATERIAL OF WHICH SAID OUTER STRING, OPPOSITE SAID CORRUGATED SECTION, IS MADE BEING GREATER THAN THE WALL THICKNESS OF SAID CORRUGATED SECTION TIMES THE MAXIMUM COMPRESSIVE STRENGTH OF THE MATERIAL OF WHICH SAID CORRUGATED SECTION IS MADE, THE OUTER CROSS-SECTIONAL PERIMETER OF SAID CORRUGATED SECTION BEING GREATER THAN THE INTERNAL CIRCUMFERENCE OF SAID OUTER STRING OPPOSITE SAID CORRUGATED SECTION, PLACING AT LEAST THE TOP PORTION OF SAID INNER STRING OF CASING IN TENSION, AND WHILE SAID
Claim 2
Dependent Claim
155 words
IN A METHOD FOR CASING A WELL IN WHICH METHOD AN INNER STRING OF CASING IS RUN INSIDE AN OUTER STRING OF CASING AND A SEAL IS FORMED BETWEEN THE STRINGS AT THE TOP OF THE WELL, THE IMPROVEMENT COMPRISING INCLUDING A LONGITUDINALLY CORRUGATED MALLEABLE METALLIC SECTION NEAR THE TOP OF SAID INNER STRING AT A LOCATION WITHIN SAID OUTER STRING, THE WALL THICKNESS OF SAID OUTER STRING, OPPOSITE SAID CORRUGATED SECTION, TIMES THE MAXIMUM TENSILE STRENGTH OF THE MATERIAL OF WHICH SAID OUTER STRING, OPPOSITE SAID CORRUGATED SECTION, IS MADE BEING GREATER THAN THE WALL THICKNESS OF SAID CORRUGATED SECTION TIMES THE MAXIMUM COMPRESSIVE STRENGTH OF THE MATERIAL OF WHICH SAID CORRUGATED SECTION IS MADE, THE OUTER CROSS-SECTIONAL PERIMETER OF SAID CORRUGATED SECTION BEING GREATER THAN THE INTERNAL CIRCUMFERENCE OF SAID OUTER STRING OPPOSITE SAID CORRUGATED SECTION, PLACING AT LEAST THE TOP PORTION OF SAID INNER STRING OF CASING IN TENSION, AND WHILE SAID
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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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |