Patent US3296100A successfully refreshed from Google Patents.
US3296100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing anticorrosive surface treated steel sheets and product thereof
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1963-04-29
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Granted: 1967-01-03
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Expires: 1983-04-29
Abstract
No abstract record available.
Inventors
- 👤 Yonezaki Shigeru
- 👤 Nitto Hajime
- 👤 Asano Hidejiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:18
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
A PROCESS FOR PRODUCING SURFACE-TREATED ANTICORROSIVE STEEL SHEET, COMPRISING IMMERSING A STEEL SHEET IN A DILUTE AQUEOUS TREATING SOLUTION CONSISTING ESSENTIALLY OF 10-15 G./L. CHROMIC ANHYDRIDE AND A SULPHURIC ACID RADICAL AND TRIVALENT CHROMIUM ANHYDRIDE AND A SULPHURIC ACID RADICAL AND TRIVALENT CHROMIUM IONS EACH IN AN AMOUNT OF 0.2 TO 5% BY WEIGHT OF THE CHROMIC ANHYDRIDE IN SAID SOLUTION, AND ELECTROLYZING SAID SOLUTION WITH SAID STEEL SHEET AS A CATHODE, WHEREBY AN INTERMEDIATE LAYER OF METALLIC CHROMIUM IS FIRST FORMED ON THE SURFACE OF STEEL SHEET AND A CHEMICALLY TREATED LAYER OF NON-METALLIC CHROMATE IS THEN FORMED THEREON.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |