US3000767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning internal ferrous metal surfaces of steam generating equipment
Assignee: Solvent Service Inc
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Filing: 1959-04-30
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Granted: 1961-09-19
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Expires: 1979-04-30
Abstract
No abstract record available.
Inventors
- 👤 William R Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
C; C23; C23G; C23G1/00; F; F28; F28G; F28G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
THE METHOD OF REMOVING COPPER-CONTAINING INCRUSTATIONS DEPOSITED UPON THE FERROUS METAL SURFACES OF HIGH PRESSURE STEAM GENERATING EQUIPMENT WHICH COMPRISES THE STEPS OF FIRST INUNDATING THE INCRUSTED SURFACES WITH AN AQUEOUS AMMONIA SOLUTION CONTAINING AMMONIUM HYDROXIDE, POTASSIUM BROMATE AND AMMONIUM NITRATE AS AN OXIDIZING AGENT AND ALLOWING THE SOLUTION TO REMAIN IN CONTACT WITH THE INCRUSTATION UNTIL THE SOLUTION NO LONGER INCREASES IN COPPER CONTENT, REMOVING THE SPENTM AQUEOUS AMMMONIA SOLUTION OF THE OXIDIZING AGENT FROM THE TREATED FERROUS METAL SURFACE AND RINSING THE SAME, SUBSEQUENTLY INUNDATING THE FERROUS METAL SURFACES WITH AN AQUEOUS SOLUTION OF HYDROCHLORIC ACID CONTAINING 5% TO 25% OF HC1 AND CONTAINING THIOUREA (H2NCS.NH2) AS SEQUESTERING AGENT AND ALLOWING THE ACID TO ACT UPON THE INCRUSTATION UNTIL THE DISSOLVING ACTION HAS SUBSTANTIALLY CEASED, REMOVING THE RESULTING SPENT ACID AND SEQUESTERED COPPER FROM THE TREATED SURFACE AND RINSING THE SAME.
Claim 2
Independent Claim
143 words
THE METHOD OF REMOVING COPPER-CONTAINING INCRUSTATIONS DEPOSITED UPON THE FERROUS METAL SURFACES OF HIGH PRESSURE STEAM GENERATING EQUIPMENT WHICH COMPRISES THE STEPS OF FIRST INUNDATING THE INCRUSTED SURFACES WITH AN AQUEOUS AMMONIA SOLUTION CONTAINING AMMONIUM HYDROXIDE, POTASSIUM BROMATE AND AMMONIUM NITRATE AS AN OXIDIZING AGENT AND ALLOWING THE SOLUTION TO REMAIN IN CONTACT WITH THE INCRUSTATION UNTIL THE SOLUTION NO LONGER INCREASES IN COPPER CONTENT, REMOVING THE SPENTM AQUEOUS AMMMONIA SOLUTION OF THE OXIDIZING AGENT FROM THE TREATED FERROUS METAL SURFACE AND RINSING THE SAME, SUBSEQUENTLY INUNDATING THE FERROUS METAL SURFACES WITH AN AQUEOUS SOLUTION OF HYDROCHLORIC ACID CONTAINING 5% TO 25% OF HC1 AND CONTAINING THIOUREA (H2NCS.NH2) AS SEQUESTERING AGENT AND ALLOWING THE ACID TO ACT UPON THE INCRUSTATION UNTIL THE DISSOLVING ACTION HAS SUBSTANTIALLY CEASED, REMOVING THE RESULTING SPENT ACID AND SEQUESTERED COPPER FROM THE TREATED SURFACE AND RINSING THE SAME.
References Cited (Backward Citations)
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US2396938A
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US2567835A
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US2628199A
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US2710792A
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US2674523A
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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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |