US4192844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methoxypropylamine and hydrazine steam condensate corrosion inhibitor compositions and methods
Assignee: ECC SPECIALTY CHEMICALS Inc
•
Filing: 1978-08-23
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Granted: 1980-03-11
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Expires: 1998-08-23
Abstract
Abstract Use of methoxypropylamine as a neutralizing amine in combination with hydrazine to prevent corrosion in steam condensate systems or in other low solids aqueous systems.
Inventors
- 👤 William L. Trace
- 👤 Jerry L. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:13
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
A steam condensate corrosion inhibiting composition consisting essentially of methoxypropylamine and from 1 to 15% by weight hydrazine.
Claim 2
Dependent Claim
18 words
A steam condensate corrosion inhibiting composition consisting essentially of methoxypropylamine and from 1 to 15% by weight hydrazine.
Claim 3
Dependent Claim
18 words
A steam condensate corrosion inhibiting composition as in claim 1 which contains approximately 7 percent by weight hydrazine.
Claim 4
Independent Claim
33 words
A method of inhibiting corrosion in steam condensate systems which comprises maintaining in said systems an effective amount of a composition consisting essentially of methoxypropylamine and from 1 to 15% by weight hydrazine.
Claim 5
Independent Claim
33 words
A method of inhibiting corrosion in steam condensate systems which comprises maintaining in said systems an effective amount of a composition consisting essentially of methoxypropylamine and from 1 to 15% by weight hydrazine.
Claim 6
Dependent Claim
26 words
A method of inhibiting corrosion in steam condensate systems as in claim 3 wherein a concentration of at least 1.0 mg/l of said composition is maintained.
References Cited (Backward Citations)
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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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |