Patent US2817218A successfully refreshed from Google Patents.
US2817218A
Expired / Lapsed
US
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Method for stopping leaks in tanks
Assignee: Constock Liquid Methane Corp
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Filing: 1954-08-18
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Granted: 1957-12-24
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Expires: 1974-08-18
Abstract
No abstract record available.
Inventors
- 👤 Beckwith Sterling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:03
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/164; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0441; Y10T137/0452; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49746
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
THE METHOD OF STOPPING A LEAK IN THE POROUS INSULATING LINING OF A METALLIC WALLED TANK FROM THE OUTSIDE WHICH TANK CONTAINS A COLD BOILING LIQUID, SUCH FOR EXAMPLE AS METHANE, WHICH CONSISTS IN MAKING A HOLE IN THE METAL WALL AT THE POINT WHERE THE LEAK HAS PERMITTED THE LIQUID METHANE TO CONTACT AND CHILL THE TANK WALL, FORCING INTO THE LINING THROUGH THE HOLE UNDER PRESSURE CARBON DIOXIDE IN GASEOUS PHASE, THE FREEZING POINT OF WHICH IS ABOVE THE TEMPERATURE OF THE LIQUID CONTENTS OF THE TANK, CONTINUING THE INTRODUCTION OF THE CARBON DIOXIDE UNTIL IT HAS PENETRATED THE PORES OF THE LINING ABOUT THE LEAK, HAS FILLED THE LEAK AND FORMED A SOLID, DRY ICE PLUG CLOSING THE LEAK.
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) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |