US3202732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repairing refractory lined vessels
Assignee: Shell USA Inc
•
Filing: 1962-05-14
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Granted: 1965-08-24
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Expires: 1982-05-14
Abstract
No abstract record available.
Inventors
- 👤 Steven S Braun
- 👤 Le Roy H Markway
- 👤 Donald O Chrismer
- 👤 John W Burks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
E; E04; E04G; E04G23/00; E04G23/02; E04G23/0203; E04G23/0211; F; F27; F27D; F27D1/00; F27D1/16; F27D1/1636; F27D2001/1605; F27D2001/1615; F27D9/00; F27D2009/0002; F27D2009/0005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49716
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
THE METHOD OF PATCHING A HOT VESSEL HAVING AN OUTER STEEL WALL AND AN INNER REFRACTORY LINING, SAID VESSEL BEING IN OPERATION NORMAL IN SERVICE TEMPERATURE AND PRESSURE, SAID METHOD COMPRISING TAPPING THE STEEL WALL OF SAID VESSEL AT A POINT WHERE THE OUTSIDE SURFACE OF THE STEEL WALL HAS DEVELOPED A HOT SPOT WHILE THE VESSEL IS UNDER OPERATING CONDITIONS NORMAL AS TO TEMPERATURE AND PRESSURE, INJECTING A COOLING GAS INTO THE VESSEL AND THROUGH THE OPENING MADE IN SAID VESSEL WALL BY SAID TAPPING AND FLOWING SAID GAS THROUGH THE WALL AND INTO THE VOIDS OF THE MATERIAL ADJACENT THE STEEL WALL TO SUBSTANTIALLY REDUCE THE STEEL WALL TEMPERATURE AROUND THE TAPPED POINT AND THE TEMPERATURE OF THE MATERIAL ADJACENT THE STEEL WALL TO A TEMPERATURE AT WHICH REPAIRS MAY BE CARRIED OUT, AND THEREAFTER INJECTING BY PRESSURE MEANS A FLOWABLE AQUEOUS REFRACTORY MATERIAL THROUGH SAID OPENING AND INTO THE VOIDS OF SAID REFRACTORY MATERIAL FROM THE BACK SIDES THEREOF.
Claim 2
Independent Claim
162 words
THE METHOD OF PATCHING A HOT VESSEL HAVING AN OUTER STEEL WALL AND AN INNER REFRACTORY LINING, SAID VESSEL BEING IN OPERATION NORMAL IN SERVICE TEMPERATURE AND PRESSURE, SAID METHOD COMPRISING TAPPING THE STEEL WALL OF SAID VESSEL AT A POINT WHERE THE OUTSIDE SURFACE OF THE STEEL WALL HAS DEVELOPED A HOT SPOT WHILE THE VESSEL IS UNDER OPERATING CONDITIONS NORMAL AS TO TEMPERATURE AND PRESSURE, INJECTING A COOLING GAS INTO THE VESSEL AND THROUGH THE OPENING MADE IN SAID VESSEL WALL BY SAID TAPPING AND FLOWING SAID GAS THROUGH THE WALL AND INTO THE VOIDS OF THE MATERIAL ADJACENT THE STEEL WALL TO SUBSTANTIALLY REDUCE THE STEEL WALL TEMPERATURE AROUND THE TAPPED POINT AND THE TEMPERATURE OF THE MATERIAL ADJACENT THE STEEL WALL TO A TEMPERATURE AT WHICH REPAIRS MAY BE CARRIED OUT, AND THEREAFTER INJECTING BY PRESSURE MEANS A FLOWABLE AQUEOUS REFRACTORY MATERIAL THROUGH SAID OPENING AND INTO THE VOIDS OF SAID REFRACTORY MATERIAL FROM THE BACK SIDES THEREOF.
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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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |