Patent US3697332A successfully refreshed from Google Patents.
US3697332A
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Method for coating aluminum while avoiding objectionable wastes
Assignee: Henkel Corp
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Filing: 1971-02-11
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Granted: 1972-10-10
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Expires: 1991-02-11
Abstract
Abstract ALUMINUM SURFACES WITH GOOD CORROSION RESISTANCE AND PAINT ADHERSION PROPERTIES, TOGETHER WITH A WASTE LIQUID SUBSTANTIALLY FREE OF OBJECTIONABLE IONS ARE PRODUCED WHEN THE ALUMINUM IS TREATED WITH A SOLUTION OF PHOSPHATE, MOLYBDATE, AND FLUORIDE, AND WHEN THE WASTE STREAM IS RENDERED BASIC WITH LIME (PH 11) AND THEN NEUTRALIZED WITH SULPHURIC ACID (PH 7).
Inventors
- 👤 Mark A Kuehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:02
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/102; F04B53/1022; C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/40; C23C22/44
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |