Patent US3615912A successfully refreshed from Google Patents.
US3615912A
Expired / Lapsed
US
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Metal-treating process
Assignee: Henkel Corp
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Filing: 1970-02-16
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Granted: 1971-10-26
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Expires: 1990-02-16
Abstract
Abstract A process for forming a phosphate coating on metal surfaces wherein an alkali metal and/or ammonium orthophosphate solution, having a pH within the range of about 3.0 to 5.5 is sprayed on the metal surface at a pump pressure of from about 10 to 75 atmospheres. The process carried out in this manner is effective in both cleaning and coating the metal surfaces to which it is applied. In addition to the alkali metal and/or ammonium orthophosphate, the phosphating solution may also contain a benzoate, an hydroxyl amine, a molybdate, and a surface-active agent.
Inventors
- 👤 Friedrich Dittel
- 👤 Peter Jorns
- 👤 Walter Stenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:40
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/76; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/40; C23C22/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
The method as claimed in claim 1 wherein the phosphatizing solution used also contains from about 0.05 to 0.5 grams per liter benzoate, calculated as sodium benzoate.
Claim 2
Dependent Claim
20 words
The method as claimed in claim 2 wherein the solution contains from about 0.1 to 0.4 grams per liter benzoate.
Claim 3
Dependent Claim
38 words
The method as claimed in claim 2 wherein the phosphatizing solution also contains an accelerator selected from hydroxyl amine and hydroxyl amine salts, in an amount of from about 0.04 to 0.3 grams per liter, calculated as NH2OH.
Claim 4
Dependent Claim
25 words
The method as claimed in claim 4 wherein the phosphatizing solution also contains from about 0.01 to 0.1 gram per liter molybdate, calculated as Na2MoO4.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 5 wherein the phosphatizing solution also contains from about 0.05 to 1 gram per liter of a surface-active agent.
Claim 6
Dependent Claim
96 words
A concentrate composition, suitable for the preparation of an aqueous acidic phosphating solution for use in the method of claim 1, which concentrate composition comprises from about 60 to 97 percent by weight of a monoalkali and/or monoammonium orthophosphate, from about 3 to 12 percent by weight benzoate, calculated as sodium benzoate, an accelerator selected from hydroxyamine and hydroxylamine salts, in an amount up to about 7 percent by weight, calculated as NH2OH, up to about 3 percent by weight molybdate, calculated as Na2MoO4 and up to about 12 percent by weight of a surface-active agent.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |