US4381249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rust removing and metal surface protecting composition
Assignee: Individual
•
Filing: 1979-05-14
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Granted: 1983-04-26
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Expires: 1999-05-14
Abstract
Abstract A rust removing and metal surface protecting composition, which comprises about 99.5% by weight of phosphoric acid at 85% concentration, from 0.11 to 0.14% by weight of 1,3-dibutyl thiourea, from 0.09 to 0.11% by weight of 1,3-diethyl thiourea, about 0.025% by weight of a non-ionic surface active agent, from 0.10 to 0.20% by weight of an organic solvent, and from 0.08 to 0.18% by weight of an amine selected from the group consisting of polyoxyethylene fatty alkyl amines containing 2 to 15 moles of ethylene oxide, the fatty alkyl group of which being derived from fatty acids having 12 to 18 carbon atoms. The composition is effective in removing rust on metal surfaces and protecting the metal against corrosion with a hard, crystalline phosphate coating. It can be easily applied by dipping, spraying or brushing.
Inventors
- 👤 Joseph O. Bouffard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:25
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23G; C23G1/00; C23G1/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A rust removing and metal surface protecting composition, which consists essentially of about 99.5% by weight of phosphoric acid at 85% concentration, from 0.11 to 0.14% by weight of 1,3-dibutyl thiourea, from 0.09 to 0.11% by weight of 1,3-diethyl thiourea, about 0.025% by weight of a non-ionic surface active agent, from 0.10 to 0.20% by weight of a lower monohydric alcohol, and from 0.08 to 0.18% by weight of an amine selected from the group consisting of polyoxyethylene fatty alkyl amines containing 2 to 15 moles of ethylene oxide, the fatty alkyl group of which being derived from fatty acids containing 12 to 18 carbon atoms.
Claim 2
Dependent Claim
106 words
A rust removing and metal surface protecting composition, which consists essentially of about 99.5% by weight of phosphoric acid at 85% concentration, from 0.11 to 0.14% by weight of 1,3-dibutyl thiourea, from 0.09 to 0.11% by weight of 1,3-diethyl thiourea, about 0.025% by weight of a non-ionic surface active agent, from 0.10 to 0.20% by weight of a lower monohydric alcohol, and from 0.08 to 0.18% by weight of an amine selected from the group consisting of polyoxyethylene fatty alkyl amines containing 2 to 15 moles of ethylene oxide, the fatty alkyl group of which being derived from fatty acids containing 12 to 18 carbon atoms.
Claim 3
Dependent Claim
21 words
A composition as claimed in claim 1, wherein the surface active agent is a nonylphenoxypolyoxyethylenethanol containing 10-11 moles of ethylene oxide.
Claim 4
Dependent Claim
13 words
A composition as claimed in claim 1, wherein the alcohol is isopropyl alcohol.
Claim 5
Dependent Claim
20 words
A composition as claimed in claim 1, wherein the amine is a polyoxyethylene oleylamine containing 5 moles of ethylene oxide.
Claim 6
Dependent Claim
21 words
A composition as claimed in claim 1 or 4, wherein the amine is present in an amount of 0.15% by weight.
Claim 7
Dependent Claim
65 words
A composition as claimed in claim 1, which contains about 99.5% by weight of phosphoric acid at 85% concentration, about 0.125% by weight of 1,3-dibutyl thiourea, about 0.100% by weight of 1,3-diethyl thiourea, about 0.025% by weight of a non-ionic surface active agent, about 0.10% by weight of isopropyl alcohol and about 0.15% by weight of a polyoxyethylene oleylamine containing 5 moles of ethylene oxide.
Claim 8
Dependent Claim
21 words
A composition as claimed in claim 6, wherein the surface active agent is a nonylphenoxypolyoxyethylenethanol containing 10-11 moles of ethylene oxide.
Claim 9
Dependent Claim
23 words
A composition as claimed in claims 1, 6 or 7, diluted with water to a concentration ranging between 30 and 50% by volume.
Claim 10
Dependent Claim
21 words
A composition as claimed in claims 1, 6 or 7, diluted with water to a concentration of about 45% by volume.
References Cited (Backward Citations)
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Cited
US3188292A
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US3277011A
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US3325415A
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US3578607A
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CA1031675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |