Patent US3026543A successfully refreshed from Google Patents.
Patent US4292095A successfully refreshed from Google Patents.
US4292095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hydrophilization of metal surfaces and/or metal oxide surfaces
Assignee: Continental Group Inc
•
Filing: 1979-09-20
•
Granted: 1981-09-29
•
Expires: 1999-09-20
Abstract
Abstract This relates to the hydrophilization of metal surfaces and/or metal oxide surfaces. In the forming of sheet metal by drawing and wall ironing methods, in the past it has been necessary to provide lubricants so as to not only protect the metal, but also to hold down friction noises. The lubricants are difficult to remove and require expensive washing processes after the forming operation. It has been found that an hydroxide of the metal involved may be readily generated on the surface so that the surface is easily wetted by water, for example, and thereby conventional lubricants are eliminated.
Inventors
- 👤 Hans-Juergen Schlinsog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:13
CPC Classifications
C; C23; C23C; C23C26/00; B; B41; B41N; B41N3/00; B41N3/03
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A process for forming a hollow metal article from a metal sheet which comprises the steps of sequentially effecting in the absence of any intermediate step hydrophilization of metal surfaces and/or metal oxide surfaces of the sheet by generating at least one hydroxide of the metal involved on such surfaces, the hydroxide being of the lowest valence stage of the metal and then forming the hydrophilized sheet into the hollow article.
Claim 2
Dependent Claim
71 words
A process for forming a hollow metal article from a metal sheet which comprises the steps of sequentially effecting in the absence of any intermediate step hydrophilization of metal surfaces and/or metal oxide surfaces of the sheet by generating at least one hydroxide of the metal involved on such surfaces, the hydroxide being of the lowest valence stage of the metal and then forming the hydrophilized sheet into the hollow article.
Claim 3
Dependent Claim
29 words
A process for hydrophilization of metal surfaces and/or metal oxide surfaces according to claim 1 wherein said one hydroxide is of the lowest valence stage of the metal involved.
Claim 4
Dependent Claim
27 words
A process for hydrophilization of metal surfaces and/or metal oxide surfaces according to claim 1 wherein said one hydroxide is a hydroxide-containing compound of the metal involved.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein the one hydroxide of the metal involved is formed by rubbing said surface.
Claim 6
Dependent Claim
39 words
A process according to claim 1 wherein the one hydroxide of the metal involved is formed by rubbing said surface with a fleece at least five times across said surface at an average pressure of 1 kg/cm 2 .
Claim 7
Dependent Claim
22 words
A process according to claim 1 wherein the one hydroxide of the metal involved is formed by immersion in 1n-sodium hydroxide solution.
Claim 8
Dependent Claim
31 words
A process according to claim 1 wherein the one hydroxide of the metal involved is formed by immersion in 1n-sodium hydroxide solution at a temperature of 60°-80° C. for 30 minutes.
Claim 9
Dependent Claim
37 words
A process according to claim 1 wherein the one hydroxide of the metal involved is formed by heating to a temperature on the order of 200° C. for a time period on the order of 6 minutes.
Claim 10
Dependent Claim
83 words
A process for forming a hollow metal article from a metal sheet which comprises the steps of sequentially effecting in the absence of any intermediate step hydrophilization of metal surfaces and/or metal oxide surfaces of the sheet by generating at least one hydroxide of the metal involved on such surfaces and then forming the hydrophilized sheet into the hollow article, the hydroxide of the metal being formed by immersion in an electrolyte consisting of 0.5% sodium hydroxide solution and applying an electrical current.
Claim 11
Dependent Claim
83 words
A process for forming a hollow metal article from a metal sheet which comprises the steps of sequentially effecting in the absence of any intermediate step hydrophilization of metal surfaces and/or metal oxide surfaces of the sheet by generating at least one hydroxide of the metal involved on such surfaces and then forming the hydrophilized sheet into the hollow article, the hydroxide of the metal being formed by immersion in an electrolyte consisting of 0.5% sodium hydroxide solution and applying an electrical current.
Claim 12
Dependent Claim
16 words
A process according to claim 9 wherein an electrical current of 70 A/m 2 is applied.
Claim 13
Dependent Claim
20 words
A process according to claim 10 wherein the electrolyte is at room temperature and the current is an anodic current.
References Cited (Backward Citations)
US2369596A
Cited
US3231376A
Cited
US3266900A
Cited
US3549372A
Cited
US4028205A
Cited
US4149912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |