US3645790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for cleaning metal
Assignee: Hooker Chemical Corp
•
Filing: 1970-02-13
•
Granted: 1972-02-29
•
Expires: 1990-02-13
Abstract
Abstract A composition for cleaning aluminum and aluminum alloy surfaces which comprises from about 1 to 30 percent by weight phosphoric acid and from about 0.15 to 15 percent by weight nitric acid, the weight ratio of nitric acid to phosphoric acid being about 0.020.6:1. This solution further contains from about 0.05 to 20 percent by weight of a nonionic surface active agent, which is stable in the nitric acid containing solution. This cleaning composition is particularly adapted for use in the spray cleaning of aluminum alloy surfaces which contain 2 percent or more of alloy elements, such as magnesium.
Inventors
- 👤 Peter Burden
- 👤 Colin Alfred Whitton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:46
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
16 words
The method as claimed in claim 1 wherein the cleaning solution is sprayed as a foam.
Claim 2
Dependent Claim
26 words
The method as claimed in claim 1 wherein the weight ratio of nitric acid to phosphoric acid in the cleaning solution is at least about 0.04:1.
Claim 3
Dependent Claim
21 words
The method as claimed in claim 3 wherein the surface active agent in the cleaning solution is a nonylphenol-ethylene oxide condensate.
Claim 4
Dependent Claim
26 words
The method as claimed in claim 4 wherein the cleaning solution also contains an inhibitor for the attack of the acid solution on iron and steel.
Claim 5
Dependent Claim
36 words
The method as claimed in claim 5 in which the inhibitor in the solution is di-n-butylthiourea, which is present in an amount within the range of about 0.001 to 0.02 percent by weight of the solution.
References Cited (Backward Citations)
US2430435A
Cited
US2662814A
Cited
US3041285A
Cited
US2867514A
Cited
US3448055A
Cited
US3457107A
Cited
US3410803A
Cited
US3518118A
Cited
US3458354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |