Patent US2935429A successfully refreshed from Google Patents.
US2935429A
Expired / Lapsed
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Method for cleaning non-drainable tubes
Assignee: Dow Chemical Co
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Filing: 1956-07-25
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Granted: 1960-05-03
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Expires: 1976-07-25
Abstract
No abstract record available.
Inventors
- 👤 Victor W Grotlisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:13
CPC Classifications
F; F28; F28G; F28G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE METHOD OF CLEANING NON-DRAINABLE TUBES OF A SUPERHEATER WHOSE TUBES ARE CONNECTED TO FLUID INLET MEANS AT ONE END AND TO FLUID OUTLET MEANS AT THE OTHER END THEREOF, COMPRISING PUMPING AN ACID SOLVENT THROUGH SAID TUBES FROM ONE END THEREOF, THEN PUMPING AN ACID SOLVENT THROUGH SAID TUBES FROM THE OTHER END THEREOF, PURGING SAID TUBES WITH GAS, FLUSHING SAID TUBES WITH WATER, CIRCULATING A NEUTRALIZING FLUID THROUGH SAID TUBES, AGAIN PURGING SAID TUBES WITH GAS, AND FLUSHING SAID TUBES WITH WATER.
Claim 2
Independent Claim
84 words
THE METHOD OF CLEANING NON-DRAINABLE TUBES OF A SUPERHEATER WHOSE TUBES ARE CONNECTED TO FLUID INLET MEANS AT ONE END AND TO FLUID OUTLET MEANS AT THE OTHER END THEREOF, COMPRISING PUMPING AN ACID SOLVENT THROUGH SAID TUBES FROM ONE END THEREOF, THEN PUMPING AN ACID SOLVENT THROUGH SAID TUBES FROM THE OTHER END THEREOF, PURGING SAID TUBES WITH GAS, FLUSHING SAID TUBES WITH WATER, CIRCULATING A NEUTRALIZING FLUID THROUGH SAID TUBES, AGAIN PURGING SAID TUBES WITH GAS, AND FLUSHING SAID TUBES WITH WATER.
References Cited (Backward Citations)
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US1934826A
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US2222516A
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US2524757A
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US2655160A
Cited
US2636502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |