US3723162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreatment of metal surfaces
Assignee: Bayer AG
•
Filing: 1970-12-14
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Granted: 1973-03-27
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Expires: 1990-12-14
Abstract
Abstract Sheet metal whose surfaces have been freshly prepared chemically as by pickling and/or nickel coating, is covered with a coating of a water-soluble polyphosphate which may include an emulsifier and/or a water-soluble organic polymer, preferably film-forming. The coating protects the fresh surface during storage and/or shaping and the metal may thereafter be enamelled either with or without prior removal of the polyphosphate coating.
Inventors
- 👤 L Leontaritis
- 👤 N Schon
- 👤 H Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/184; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/23; C23C22/68; C23D; C23D3/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12986; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
13 words
A process according to claim 1, wherein n is at least about 100.
Claim 2
Dependent Claim
22 words
A process according to claim 1, wherein the polyphosphate coating includes an organic water-soluble polymer, which polymer serves to plasticize the poly-phosphate.
Claim 3
Dependent Claim
14 words
A process according to claim 3, wherein said organic water-soluble polymer is itself film-forming.
Claim 4
Dependent Claim
13 words
A process according to claim 1, wherein the polyphosphate film includes an emulsifier.
Claim 5
Dependent Claim
27 words
A process according to claim 1, wherein n is at least about 100, and wherein said polyphosphate coating includes an emulsifier aNd a film-forming organic water-soluble polymer.
Claim 6
Dependent Claim
109 words
In the production of a shaped metal structure having an adherent protective layer, comprising the steps of chemically or electrolytically pretreating a metal sheet to provide a fresh surface, shaping said sheet into a structure and providing an adherent, protective layer on said shaped structure, the improvement which comprises covering said fresh surface with a coating of at least about 0.2 grams per square meter of water-soluble mixed sodium and potassium salt of a polyphosphoric acid of the formula HO(HOPO2)nH in which n is at least about 10, before shaping whereby said fresh surface is unimpaired during shaping and is directly ready for receipt of the adherent protective layer.
Claim 7
Dependent Claim
49 words
A metal structure having a freshly prepared chemically or electrolytically treated surface and a protective coating of at least about 0.2 grams per square meter of a water-soluble mixed sodium and potassium salt of a polyphosphoric acid of the formula HO(HOPO2)nH in which n is at least about 10.
Claim 8
Dependent Claim
49 words
A steel sheet according to claim 8, wherein said pretreatment is a nickel coating, and said protective coating is a mixed sodium-potassium salt of a polyphosphoric acid of the formula HO(HOPO2)nH wherein n is at least about 100, said coating including an emulsifier and a film-forming organic water-soluble polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |