US4235734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed acids stabilized with alkanols
Assignee: Schlumberger Technology Corp
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Filing: 1978-11-30
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Granted: 1980-11-25
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Expires: 1998-11-30
Abstract
Abstract A liquid, foamable acid composition is described which comprises a liquid foaming agent (i.e., a surfactant) and an alkanol or an inertly-substituted alkanol dissolved in an aqueous acid. The foamed compositions find utility, for example, in cleaning ferrous surfaces.
Inventors
- 👤 Gary A. Scherubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:16
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0094; C11D7/00; C11D7/02; C11D7/04; C11D7/08; C11D7/22; C11D7/26; C11D7/263; C11D7/32; C11D7/3227; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/16; Y; Y10; Y10S; Y10S507/00; Y10S507/933
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
38 words
A foam derived from a foamable acid composition comprising (a) a foam-generating amount of at least one soluble cationic surfactant, (b) a foam-stabilizing amount of at least one alkanol or inertly-substituted alkanol, dissolved in (c) an aqueous acid.
Claim 2
Dependent Claim
38 words
A foam derived from a foamable acid composition comprising (a) a foam-generating amount of at least one soluble cationic surfactant, (b) a foam-stabilizing amount of at least one alkanol or inertly-substituted alkanol, dissolved in (c) an aqueous acid.
Claim 3
Dependent Claim
30 words
The composition defined by claim 1 wherein (b) is a lower alkanol, a 1,2-alkylene glycol, a polyoxyalkylene glycol, a monoether of said 1,2-alkylene glycol or polyoxyalkylene glycol, or mixtures thereof.
Claim 4
Dependent Claim
66 words
The composition defined by claim 2 wherein (b) is an ethoxylated alkanol or phenol in which from 1 to 4 moles of ethylene oxide are condensed onto an alkanol of from 1 to 4 carbon atoms or phenol, a polyoxyethylene glycol having an average molecular weight of from 200 to about 2000, or a polyoxypropylene glycol having an average molecular weight of up to about 500.
Claim 5
Dependent Claim
29 words
The composition defined by claim 3 wherein (b) is ethylene glycol n-butyl ether or a polyoxypropylene glycol having an average molecular weight of from about 350 to about 450.
Claim 6
Dependent Claim
24 words
The composition defined by claim 4 wherein (b) is a polyoxypropylene glycol having an average molecular weight of from about 350 to about 450.
Claim 7
Dependent Claim
17 words
The composition defined by claim 1 wherein said acid is hydrochloric acid, sulfuric acid or formic acid.
Claim 8
Dependent Claim
12 words
The composition defined by claim 6 wherein said acid is hydrochloric acid.
Claim 9
Dependent Claim
40 words
The composition defined by claim 1 wherein (b) is ethylene glycol monobutyl ether or a polyoxypropylene glycol having an average molecular weight of from about 350 to about 450, and (c) is aqueous hydrochloric acid, sulfuric acid or formic acid.
Claim 10
Dependent Claim
11 words
The composition defined by claim 8 wherein (c) is hydrochloric acid.
Claim 11
Dependent Claim
24 words
The composition defined by claim 9 wherein (b) is a polyoxypropylene glycol having an average molecular weight of from about 350 to about 450.
Claim 12
Dependent Claim
35 words
In the process of cleaning acid-soluble encrustations from ferrous surfaces by contacting the encrusted surface with a foamed acid composition, the improvement comprising using the composition defined by claim 1 as the foamed acid composition.
Claim 13
Dependent Claim
72 words
A foam derived from a foamable acid composition consisting essentially of (a) from about 0.25 to about 5 weight percent of a cationic surfactant mixture of about 3 parts cocotrimethylammonium chloride and about one part bis(2-hydroxyethyl) cocoamine oxide, (b) from about 0.25 to about 7 volume percent of ethylene glycol monobutyl ether or a polyoxypropylene glycol having an average molecular weight of about 350 to 450, dissolved in (c) aqueous hydrochloric acid.
Claim 14
Dependent Claim
72 words
A foam derived from a foamable acid composition consisting essentially of (a) from about 0.25 to about 5 weight percent of a cationic surfactant mixture of about 3 parts cocotrimethylammonium chloride and about one part bis(2-hydroxyethyl) cocoamine oxide, (b) from about 0.25 to about 7 volume percent of ethylene glycol monobutyl ether or a polyoxypropylene glycol having an average molecular weight of about 350 to 450, dissolved in (c) aqueous hydrochloric acid.
Claim 15
Dependent Claim
12 words
The composition defined by claim 12 additionally containing an acid corrosion inhibitor.
Claim 16
Dependent Claim
35 words
In the process of cleaning acid-soluble encrustations from ferrous surfaces by contacting the encrusted surface with a foamed acid composition, the improvement comprising using the composition defined by claim 13 as the foamed acid composition.
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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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |