Patent US3553034A successfully refreshed from Google Patents.
US3553034A
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US
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Composition and process for inhibiting corrosion of zinc surfaces
Assignee: John Lysaght Australia Pty Ltd
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Filing: 1968-04-04
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Granted: 1971-01-05
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Expires: 1988-04-04
Abstract
Abstract A PROCESS FOR PROVIDING A CORROSION RESISTANT PASSIVATING FILM ON A ZINC SURFACE, WHEREIN THE SURFACE IS TREATED WITH AN AQUEOUS SOLUTION OF A CHROMIC ACID WITH PART OF THE HEXAVALENT CHROMIUM REDUCED TO OR REPLACED BY TRIVALENT CHROMIUM, WITH THE PH OF THE SOLUTION MAINTAINED IN THE RANGE OF 2.8-3.8 BY THE ADDITION OF A PH CONTROL AGENT.
Inventors
- 👤 Grahame J Harvey
- 👤 Donald I Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:16
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/30
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |