US3850657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sealing leaks in closed cooling systems
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1972-09-26
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Granted: 1974-11-26
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Expires: 1992-09-26
Abstract
Abstract Leaks in closed cooling systems using water as coolant can be sealed by having present in the coolant a chemical compound of a readily reducible metal, e.g., an oxide of copper, which precipitates a sealant upon addition to the coolant of an oxygenyielding substance (e.g., air) and a complexing agent having an alkaline reaction (e.g., morpholin).
Inventors
- 👤 M Bodmer
- 👤 D Hartinger
- 👤 A Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:01
CPC Classifications
F; F28; F28F; F28F11/00; C; C09; C09K; C09K3/00; C09K3/12; F01; F01P; F01P11/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A METHOD FOR SEALING LEAKS IN A CLOSED COOLING SYSTEM USING WATER AS THE WORKING AN EASILY REDUCIBLE MATEL OXIDE SELECT DUCING INTO THE WATER AN EASILY REDUCIBLE METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, GOLD, TIN, NICKEL, CADMIUM, LEAD, COBALT, PLATINUM, RHODIUM, IRIDIUM AND PALLADIUM WHEREIN THE MOLE RATIO OF METAL CATIONS IS FROM 10**-8 TO 1 MOLAR, INTRODUCING A REDUCING AGENT INTO SAID WATER IN A CONCENTRATION OF BETWEEN 10**-6 AND 1 MOLAR, SO AS TO CAUSE ELECTROLESS PRECIPITATION OF THE METAL WHEREBY LEAKS IN THE CLOSED COOLING SYSTEM ARE SEALED.
Claim 2
Independent Claim
96 words
A METHOD FOR SEALING LEAKS IN A CLOSED COOLING SYSTEM USING WATER AS THE WORKING AN EASILY REDUCIBLE MATEL OXIDE SELECT DUCING INTO THE WATER AN EASILY REDUCIBLE METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF COPPER, SILVER, GOLD, TIN, NICKEL, CADMIUM, LEAD, COBALT, PLATINUM, RHODIUM, IRIDIUM AND PALLADIUM WHEREIN THE MOLE RATIO OF METAL CATIONS IS FROM 10**-8 TO 1 MOLAR, INTRODUCING A REDUCING AGENT INTO SAID WATER IN A CONCENTRATION OF BETWEEN 10**-6 AND 1 MOLAR, SO AS TO CAUSE ELECTROLESS PRECIPITATION OF THE METAL WHEREBY LEAKS IN THE CLOSED COOLING SYSTEM ARE SEALED.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said easily reducible metal oxide is copper oxide which is produced in situ by corrosive action of the cooling water on the cooling pipes.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the corrosion products are induced by the addition of air into the water medium.
References Cited (Backward Citations)
US1746028A
Cited
US3709712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |