US2998361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical treatment of metal surfaces and the products thereof
Assignee: Toyo Kohan Co Ltd
•
Filing: 1959-02-10
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Granted: 1961-08-29
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Expires: 1979-02-10
Abstract
No abstract record available.
Inventors
- 👤 Kitamura Yoichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:42
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12583
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD OF FORMING A PROTECTIVE COATING ON A METAL SURFACE, WHICH COMPRISES SUBJECTING AS CATHODE AN ARTICLE HAVING A METAL SURFACE TO ELECTROLYSIS IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF WATER, 20-100 GRAMS PER LITER OF CHROMIC ACID, AND 0.2-4.0 GRAMS PER LITER OF AN AROMATIC DISULFONIC ACID CONTAINING A PHENOLIC HYDROXYL GROUP AND BEING ADAPTED TO FORM A CHELATE COMPOUND WITH A METAL ION.
Claim 2
Independent Claim
66 words
A METHOD OF FORMING A PROTECTIVE COATING ON A METAL SURFACE, WHICH COMPRISES SUBJECTING AS CATHODE AN ARTICLE HAVING A METAL SURFACE TO ELECTROLYSIS IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF WATER, 20-100 GRAMS PER LITER OF CHROMIC ACID, AND 0.2-4.0 GRAMS PER LITER OF AN AROMATIC DISULFONIC ACID CONTAINING A PHENOLIC HYDROXYL GROUP AND BEING ADAPTED TO FORM A CHELATE COMPOUND WITH A METAL ION.
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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |