US3969260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosive inhibitor compositions
Assignee: Universal Oil Products Co
•
Filing: 1974-07-03
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Granted: 1976-07-13
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Expires: 1994-07-03
Abstract
Abstract A synergistic mixture comprising an alkynyl cycloalkanol and N,N'-dicycloalkyl-thiourea and polyaminomethylenephosphonate is used as an inhibitor in protecting metals from acid attack when cleaning said metals with an acid solution.
Inventors
- 👤 Herbert D. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:11
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
40 words
The synergistic mixture of from about 30% to about 40% by weight of a lower alkynyl cycloalkanol, of from about 30% to about 40% by weight of an N,N'-dicycloalkyl-thiourea and from about 30% to about 40% by weight of polyaminomethylenephosphonate.
Claim 2
Dependent Claim
40 words
The synergistic mixture of from about 30% to about 40% by weight of a lower alkynyl cycloalkanol, of from about 30% to about 40% by weight of an N,N'-dicycloalkyl-thiourea and from about 30% to about 40% by weight of polyaminomethylenephosphonate.
Claim 3
Dependent Claim
13 words
The mixture of claim 1 in which said alkynyl cycloalkanol is ethynyl cyclohexanol.
Claim 4
Dependent Claim
13 words
The mixture of claim 1 in which said alkynyl cycloalkanol is propynyl cyclohexanol.
Claim 5
Dependent Claim
12 words
The mixture of claim 1 in which said alkynyl is ethynyl cyclopentanol.
Claim 6
Dependent Claim
11 words
The mixture of claim 1 in which said N,N'-dicycloalkyl-thiourea is N,N'-dicyclohexyl-thiourea.
Claim 7
Dependent Claim
34 words
The method of removing scale from a metal surface in a boiler used to generate steam from water which comprises treating said surface with an acid solution containing the synergistic mixture of claim 1.
References Cited (Backward Citations)
US3382179A
Cited
US3778377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |