US3909437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noncorrosive acid, solvent and nonionic surfactant composition
Assignee: Schlumberger Technology Corp
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Filing: 1973-01-18
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Granted: 1975-09-30
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Expires: 1993-01-18
Abstract
Abstract A cleaning solvent useful in the cleaning of metal surfaces, e.g. nickle-iron alloys, contains sulfamic acid, citric acid, a solvent for hydrocarbon residues, and a surfactant.
Inventors
- 👤 George B Alexander
- 👤 Norman F Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:40
CPC Classifications
C; C23; C23G; C23G1/00; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2086; C11D3/43; C11D7/00; C11D7/02; C11D7/04; C11D7/08; C23G1/02; C23G1/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A COMPOSITION COMPRISING IN PERCENTAGE BY WEIGHT THE FOLLOWING INGREDIENTS: A. ABOUT 8 TO 12% SULFAMIC ACID, B. ABOUT 4 TO 6% CITRIC ACID C. ABOUT 4 TO 6% OF A NONIONIC SOLVENT FOR HYDROCARBON RESIDUES WHICH SOLVENT IS CHARACTERIZED AS NOT PRODUCING TURBIDITY AT 75*F. WHEN PRESENT IN SAID COMPOSITION, D. ABOUT 0.095 TO 15% OF A SOLUBLE NONIONIC SURFACTANT WHICH SURFACTANT IS CHARACTERIZED AS HAVING A CLOUD POINT OF AT LEAST ABOUT 90*F. AND HAVING A SURFACE TENTION OF ABOUT 32 DYNES/CM. OR LESS WHEN PRESENT IN AN AMOUNT OF 0.1% OF SAID COMPOSITION, AND E. THE BALANCE, WATER.
Claim 2
Dependent Claim
101 words
A COMPOSITION COMPRISING IN PERCENTAGE BY WEIGHT THE FOLLOWING INGREDIENTS: A. ABOUT 8 TO 12% SULFAMIC ACID, B. ABOUT 4 TO 6% CITRIC ACID C. ABOUT 4 TO 6% OF A NONIONIC SOLVENT FOR HYDROCARBON RESIDUES WHICH SOLVENT IS CHARACTERIZED AS NOT PRODUCING TURBIDITY AT 75*F. WHEN PRESENT IN SAID COMPOSITION, D. ABOUT 0.095 TO 15% OF A SOLUBLE NONIONIC SURFACTANT WHICH SURFACTANT IS CHARACTERIZED AS HAVING A CLOUD POINT OF AT LEAST ABOUT 90*F. AND HAVING A SURFACE TENTION OF ABOUT 32 DYNES/CM. OR LESS WHEN PRESENT IN AN AMOUNT OF 0.1% OF SAID COMPOSITION, AND E. THE BALANCE, WATER.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the nonionic solvent for hydrocarbon residues is a glycol ether.
Claim 4
Dependent Claim
21 words
The composition of claim 1 wherein the solvent is chosen from the group consisting of 2-butoxyethanol, 2-(2-butoxyethoxy)ethanol, 2-(2-ethoxyethoxy)ethanol, 2-methoxyethanol, and 2-ethoxyethanol.
Claim 5
Dependent Claim
27 words
The composition of claim 1 wherein the soluble nonionic surfactant is chosen from the group consisting of linear alcohol ethoxylates, polyoxyethylene esters, and allyl aryl polyethylene oxides.
Claim 6
Dependent Claim
28 words
The composition of claim 1 wherein the soluble nonionic surfactant is a mixture of primary alcohols of about 10 to about 12 member carbon chains, about 60% ethoxylated.
Claim 7
Dependent Claim
43 words
The composition of claim 1 comprising the following proportions: a. 10% sulfamic acid, b. 5% citric acid, c. 5% 2-butoxyethanol, d. 0.1% of a mixture of primary alcohols of about 10 to about 12 member carbon chains, about 60% ethoxyLated, e. 79.9% water.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |