US3819385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for applying a phosphate coating to iron and steel
Assignee: Henkel Corp
•
Filing: 1972-08-31
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Granted: 1974-06-25
•
Expires: 1992-08-31
Abstract
Abstract Disclosed is a method and composition useful for applying a phosphate coating to an iron or steel surface. The surface is contacted with an aqueous solution containing acidic zinc phosphate, chlorate ion and between 0.1 and 10 mg/1 vanadium, calculated as V2O5, at a temperature of less than 65* C.
Inventors
- 👤 H Schumichen
- 👤 G Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:15
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/40; C23C22/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The method of claim 1 wherein the chlorate ion content of the solution is between 1 and 10 g/l.
Claim 2
Dependent Claim
18 words
The method of claim 2 wherein the zinc content of the solution is between 1 and 10 g/l.
Claim 3
Dependent Claim
22 words
The method of claim 3 wherein the vanadium is present in an amount of from 0.4 to 7 mg/l, calculated as V2O5.
Claim 4
Dependent Claim
22 words
The method of claim 4 wherein the vanadium is present in an amount of from 0.4 to 2.7 mg/l, calculated as V2O5.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein said surface is contacted with said solution for a period of time sufficient to produce a coating of layer weight between 1.6 and 2.5 g/m2.
Claim 6
Dependent Claim
36 words
An aqueous composition useful for pretreating an iron or steel surface prior to electrophoretic paint deposition comprising acidic zinc phosphate, from 1 to 10 g/l chlorate and from 0.1 to 10 mg/l vanadium, calculated as V2O5.
Claim 7
Independent Claim
49 words
A method of maintaining the ferrous ion content of a chlorate accelerated acidic zinc phosphate solution for the treatment of iron or steel below a maximum of about 85 mg/l when the solution is below 65* C comprising including from 0.1 to 10 mg/l of vanadium, calculated as V2O5.
Claim 8
Dependent Claim
21 words
The method of claim 8 wherein the chlorate content is from 1-10 g/l and the zinc content is from 1-10 g/l.
References Cited (Backward Citations)
GB495098A
Cited
US3218200A
Cited
US2854370A
Cited
US3261723A
Cited
US3617393A
Cited
US3676224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |