Patent US4657785A successfully refreshed from Google Patents.
US4657785A
Expired / Lapsed
US
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Use of benzo and tolyltriazole as copper corrosion inhibitors for boiler condensate systems
Assignee: Ecolab USA Inc
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Filing: 1985-12-11
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Granted: 1987-04-14
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Expires: 2005-12-11
Abstract
Abstract The use of benzo and/or tolyltriazole alone or in combination with neutralizing and filming amines to reduce copper corrosion in boiler condensate systems by feeding the mixture into the main steamheaders.
Inventors
- 👤 John A. Kelly
- 👤 David A. Grattan
- 👤 Alfred W. Oberhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:51
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A method of reducing copper corrosion in a boiler condensate system operating at a pressure of at least 600 psi, which contains at least one steam header, which comprises feeding into said steam header a corrosion inhibiting amount of a triazole from the group consisting of benzotriazole, tolyltriazole or their alkali metal salts, whereby said triazoles are mixed with said steam and transported through said system to treat the copper surface to inhibit corrosion.
Claim 2
Independent Claim
74 words
A method of reducing copper corrosion in a boiler condensate system operating at a pressure of at least 600 psi, which contains at least one steam header, which comprises feeding into said steam header a corrosion inhibiting amount of a triazole from the group consisting of benzotriazole, tolyltriazole or their alkali metal salts, whereby said triazoles are mixed with said steam and transported through said system to treat the copper surface to inhibit corrosion.
Claim 3
Dependent Claim
18 words
The method of claim 1 where the triazoles are used in combination with either neutralizing or film-forming amines.
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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |