US3961992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating metal surfaces
Assignee: Lubrizol Corp
•
Filing: 1974-10-03
•
Granted: 1976-06-08
•
Expires: 1994-10-03
Abstract
Abstract Metal surfaces are treated, preferably after phosphating, with a phenol-formaldehyde composition or the like prepared under alkaline conditions, the mole ratio of formaldehyde to phenol being at least about 2:1. The phenol-formaldehyde composition is most often used as an aqueous solution. The treatment is a suitable substitute for the conventional chromate rinse.
Inventors
- 👤 Richard William Jahnke
- 👤 Russell Lee Swaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:37
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/31504; Y10T428/31678; Y10T428/31688
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
55 words
A method of rinsing a phosphated metal article which comprises contacting the surface of said phosphated article with a dilute solution consisting essentially of a solvent and the product obtained by reacting a hydroxyaromatic compound with formaldehyde under alkaline conditions, the mole ratio of said formaldehyde to said hydroxyaromatic compound being at least about 2:1.
Claim 2
Independent Claim
55 words
A method of rinsing a phosphated metal article which comprises contacting the surface of said phosphated article with a dilute solution consisting essentially of a solvent and the product obtained by reacting a hydroxyaromatic compound with formaldehyde under alkaline conditions, the mole ratio of said formaldehyde to said hydroxyaromatic compound being at least about 2:1.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the metal article is a steel or galvanized steel article.
Claim 4
Dependent Claim
18 words
A method according to claim 2 wherein the solvent is a mixture of water and a lower alkanol.
Claim 5
Dependent Claim
12 words
A method according to claim 3 wherein the hydroxyaromatic compound is phenol.
Claim 6
Dependent Claim
20 words
A method according to claim 4 wherein the metal article is a steel article and the lower alkanol is methanol.
Claim 7
Dependent Claim
18 words
A method according to claim 5 wherein the article is rinsed with water after treatment with said solution.
Claim 8
Dependent Claim
21 words
A method according to claim 4 wherein the metal article is a galvanized steel article and the lower alkanol is methanol.
Claim 9
Dependent Claim
18 words
A method according to claim 7 wherein the article is rinsed with water after treatment with said solution.
Claim 10
Dependent Claim
14 words
A metal article which has been treated according to the method of claim 1.
Claim 11
Dependent Claim
14 words
A metal article which has been treated according to the method of claim 4.
Claim 12
Dependent Claim
14 words
A metal article which has been treated according to the method of claim 5.
Claim 13
Dependent Claim
14 words
A metal article which has been treated according to the method of claim 7.
References Cited (Backward Citations)
US2705704A
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US2834745A
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US3288745A
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US3707401A
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US3519495A
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US3697331A
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US3749611A
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US3776782A
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US3868276A
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |