US3687858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning aluminum
Assignee: Henkel AG and Co KGaA
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Filing: 1969-07-23
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Granted: 1972-08-29
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Expires: 1989-07-23
Abstract
Abstract AN AQUEOUS CLEANING SOLUTION FOR CLEANING ALUMINUM SURFACES COMPRISING FROM 0.5% TO 15% BY WEIGHT OF CAUSTIC ALKALI, FROM 0.005 TO 0.2% BY WEIGHT OF AN ALKALISOLUBLE SALT OF A POLYCARBOXYLIC ACID HAVING MORE THAN 10 CARBOXYL GROUPS IN THE MOLECULE, AND FROM 0.003% TO 0.1% BY WEIGHT OF ALKALINE EARTH METAL IONS; AS WELL AS THE PROCESS OF CLEANING ALUMINUM SURFACES WHICH COMPRISES TREATING THE SURFACES WITH THE SAID AQUEOUS CLEANING SOLUTION AT A TEMPERATURE OF FROM 50*C. TO 85*C., RINSING AND DRYING THE CLEANED SURFACES.
Inventors
- 👤 Roland Geisler
- 👤 Georg Jansen
- 👤 Hans Gunther Germscheid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/22
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |