Patent US3690940A successfully refreshed from Google Patents.
US3690940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preventing rusting of steel sheets coated with aqueous slurry of metal powder
Assignee: JFE Engineering Corp
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Filing: 1970-11-17
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Granted: 1972-09-12
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Expires: 1990-11-17
Abstract
Abstract IN COATING STEEL SHEET WITH AQUEOUS SLURRY OF METAL POWDER, THE SLURRY IS ADDED WITH CORROSION INHIBITOR TO PREVENT RUSTING OF STEEL SHEET AT THE TIME OF DRYING THE COATING LAYER THEREBY IMPROVING ADHESION THEREOF TO THE STEEL SURFACE, SAID CORROSION INHIBITOR ADDITING BEING A COMPOUND CONTAINING ANY ONE OF SUCH NEGATIVE IONS AS NO2-,MOO4--ORC6H5COO- IN A CONCENTRATION RANGING FROM 10**-5 MOL/L. TO 10**-1 MOL/L.
Inventors
- 👤 Hidehisa Yamagishi
- 👤 Fumitoshi Yokoi
- 👤 Tadao Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:00
CPC Classifications
C; C23; C23F; C23F11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |