US3607484A
Expired / Lapsed
US
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Etching of aluminum
Assignee: Resonac Holdings Corp
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Filing: 1968-12-13
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Granted: 1971-09-21
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Expires: 1988-12-13
Abstract
Abstract An etchant liquid for metals (which consist mainly of aluminum) comprising an aqueous sulfuric acid solution containing halogen ions and the ions of a metal having an ionization tendency less than that of aluminum. An etching bath containing the above liquid also comprising a water-immiscible organic liquid, and a surface active agent prepared by the phosphoric esterification of a polyalkylene glycol having alkylene oxide linked with the hydrocarbon residual group thereof. A process for forming a photographic image of an acid-resistant coating applied to the surface of a metallic plate (which consists mainly of aluminum) which comprises etching the plate using the described etchant liquid or etching bath.
Inventors
- 👤 Gohein Marukawa
- 👤 Takashi Oikawa
- 👤 Ryotatsu Otsuka
- 👤 Naomi Kagaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:53
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/10; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20; C23F1/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The etching process of claim 1 wherein the etchant liquid further comprises NO3 in an amount less than about 2 gram-ions/liter.
Claim 2
Dependent Claim
35 words
The etching process of claim 1 wherein said metal is an aluminum alloy consisting essentially of about 0.5 to about 10 percent by weight Zn and a small amount of impurities, the balance being aluminum.
Claim 3
Dependent Claim
44 words
The etching process of claim 1 wherein said metal is an aluminum alloy consisting essentially of about 0.5 to about 10 percent by weight Zn, about 0.04 to about 2.0 percent by weight Sn and a small amount of impurities, the balance being aluminum.
Claim 4
Dependent Claim
145 words
An etching process which comprises splashing an etching bath upon the surface of a metallic plate, said plate comprising a metal consisting essentially of aluminum and having thereon a photographic image of an acid-resistant coating, said etching bath comprising at least one halogen ion present in a concentration of from about 0.1 to about 7.0 grams-ions/liter, from about 0.004 to about 2.0 gram-ions/liter of the ions of a metal having an ionization tendency less than that of aluminum, from about 1 percent to about 10 percent by volume of a water-immiscible organic liquid, from about 0.05 percent to about 8 percent by weight of a surface active agent prepared by the phosphoric-esterification of a condensation-type nonionic surface active agent of an alkylene oxide and from about 3 percent to about 20 percent by weight sulfuric acid, the materials recited being present in an aqueous solution.
Claim 5
Dependent Claim
21 words
The etching process of claim 5 wherein said etching bath further comprises NO3 in an amount less than about 2 gram-ions/liter.
Claim 6
Dependent Claim
44 words
The etching process of claim 5 wherein said metal is an aluminum alloy consisting essentially of about 0.5 to about 10 percent by weight Zn, about 0.04 to about 2.0 percent by weight Sn and a small amount of impurities, the balance being aluminum.
Claim 7
Dependent Claim
35 words
The etching process of claim 5 wherein said metal is an aluminum alloy consisting essentially of about 0.5 to about 10 percent by weight Zn and a small amount of impurities, the balance being aluminum.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |