Patent US2989418A successfully refreshed from Google Patents.
US2989418A
Expired / Lapsed
US
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Corrosion protection for zinc-surfaced and aluminum-surfaced articles
Assignee: Inland Steel Co
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Filing: 1957-11-29
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Granted: 1961-06-20
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Ross L Harbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:38
CPC Classifications
C; C23; C23D; C23D5/00; C23D5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR TREATING AN ARTICLE HAVING A SURFACE OF A METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, ALUMINUM, AND ALLOYS THEREOF TO PROTECT THE SURFACE AGAINST CORROSION, WHICH COMPRISES THE STEPS OF COATING THE SURFACE WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE, DRYING TO FORM A RELATIVELY INSOLUBLE AND IMCOMPLETELY DEHYDRATED SILICATE FILM ON SAID SURFACE, AND THEREAFTER IMPREGNATING THE SILICATE COATED SURFACE WITH AN AQUEOUS CHROMIC ACID SOLUTION, SAID INCOMPLETELY DEHYDRATED SILICATE FILM CONTAINING SUFFICIENT WATER SO THAT AT LEAST A PORTION OF THE ALKALI METAL SILICATE IS CONVERTED TO SILICA GEL BY THE ACTION OF SAID CHROMIC ACID SOLUTION.
Claim 2
Dependent Claim
105 words
A PROCESS FOR TREATING AN ARTICLE HAVING A SURFACE OF A METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, ALUMINUM, AND ALLOYS THEREOF TO PROTECT THE SURFACE AGAINST CORROSION, WHICH COMPRISES THE STEPS OF COATING THE SURFACE WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE, DRYING TO FORM A RELATIVELY INSOLUBLE AND IMCOMPLETELY DEHYDRATED SILICATE FILM ON SAID SURFACE, AND THEREAFTER IMPREGNATING THE SILICATE COATED SURFACE WITH AN AQUEOUS CHROMIC ACID SOLUTION, SAID INCOMPLETELY DEHYDRATED SILICATE FILM CONTAINING SUFFICIENT WATER SO THAT AT LEAST A PORTION OF THE ALKALI METAL SILICATE IS CONVERTED TO SILICA GEL BY THE ACTION OF SAID CHROMIC ACID SOLUTION.
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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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |