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Patent US2977259A successfully refreshed from Google Patents.
US2977259A
Expired / Lapsed
US
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Method of inhibiting white rust on zinc surfaces
Assignee: United States Steel Corp
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Filing: 1959-08-18
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Granted: 1961-03-28
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Expires: 1979-08-18
Abstract
No abstract record available.
Inventors
- 👤 Ludwig E Schmelzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:38
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF TREATING GALVANIZED ARTICLES TO INHIBIT WHITE RUST FORMATION, WHICH COMPRISES IMMERSING THE ARTICLES IN A DILUTE WATER SOLUTION CONTAINING FROM 0.1 TO 0.5% OF A DICHROMATE SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM OR AMMONIUM DICHROMATE AND THEN IN A DILUTE WATER SOLUTION CONTAINING FROM 0.1 TO 0.6% OF A FLUOBORATE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM FLUOBORATES, AND FROM 0.1 TO 0.4% OF ONE OF SAID DICHROMATES, SAID LAST-MENTIONED SOLUTION HAVING A PH OF FROM 4 TO 6.
Claim 2
Independent Claim
86 words
A METHOD OF TREATING GALVANIZED ARTICLES TO INHIBIT WHITE RUST FORMATION, WHICH COMPRISES IMMERSING THE ARTICLES IN A DILUTE WATER SOLUTION CONTAINING FROM 0.1 TO 0.5% OF A DICHROMATE SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM OR AMMONIUM DICHROMATE AND THEN IN A DILUTE WATER SOLUTION CONTAINING FROM 0.1 TO 0.6% OF A FLUOBORATE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM FLUOBORATES, AND FROM 0.1 TO 0.4% OF ONE OF SAID DICHROMATES, SAID LAST-MENTIONED SOLUTION HAVING A PH OF FROM 4 TO 6.
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |