US3954645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for an acid cleaning bath for metal surfaces
Assignee: Diversey Wyandotte Corp
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Filing: 1973-07-25
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Granted: 1976-05-04
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Expires: 1993-07-25
Abstract
Abstract A method for the preparation of a liquid concentrate solution containing 10 to 60 percent by weight water from which a metal cleaning solution may be prepared by dilution with additional water. The liquid concentrate was prepared from ferrous sulfate, an oxidant, an acid, a fluoride ion source and water. It may optionally contain ammonia and urea.
Inventors
- 👤 Joseph V. Otrhalek
- 👤 Raymond M. Ajluni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:29
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
The method of cleaning metal surfaces in an acid bath wherein from about 1 to 4 percent by weight, based on the weight of the bath, of an additive is incorporated into said bath, said additive consisting essentially of: a. from about 25 to 35 percent by weight of a nitrite ion source; b. from about 0 to 5 percent by weight of ammonia; and c. from about 65 to 75 percent by weight of water.
Claim 2
Independent Claim
76 words
The method of cleaning metal surfaces in an acid bath wherein from about 1 to 4 percent by weight, based on the weight of the bath, of an additive is incorporated into said bath, said additive consisting essentially of: a. from about 25 to 35 percent by weight of a nitrite ion source; b. from about 0 to 5 percent by weight of ammonia; and c. from about 65 to 75 percent by weight of water.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the nitrite ion source is selected from the group consisting of sodium nitrite, potassium nitrite and ammonium nitrite.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the nitrite ion source is sodium nitrite.
References Cited (Backward Citations)
US2975039A
Cited
US3275562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |