US3696498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreatment of metal sheets which are coated after a forming operation
Assignee: Bayer AG
•
Filing: 1970-12-03
•
Granted: 1972-10-10
•
Expires: 1990-12-03
Abstract
Abstract This invention relates to an improved process for the pretreatment of metallic materials wherein the material is subjected to a surface treatment, subsequently covered with a removable layer of a water soluble, film-forming organic polymer, formed and provided with a firmly adhering protective layer.
Inventors
- 👤 Lambis Leontaritis
- 👤 Nikolaus Schon
- 👤 Hans Hoffmann
- 👤 Aziz El Sayed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:45
CPC Classifications
C; C23; C23D; C23D3/00; C23F; C23F15/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
13 words
A process as claimed in claim 1, wherein the metallic material is steel.
Claim 2
Dependent Claim
18 words
A process as claimed in claim 1, wherein the firmly adhering protective layer is a layer of enamel.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1, wherein the shaping operation is a non-machining shaping operation.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1, wherein the water-soluble film forming organic polymer is a member selected from the group consisting of polyethylene oxide, polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose and mixtures thereof.
Claim 5
Dependent Claim
38 words
A process as claimed in claim 5, wherein the polymer is applied to the metallic material from dilute aqueous solution, the water being removed to leave a solid film, and the film being removed by water after shaping.
Claim 6
Dependent Claim
33 words
A process as claimed in claim 6, wherein the metallic material is a steel sheet which is shaped in a press, the film being removed with water and the sheet thereafter being enamelled.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |