Patent US3216835A successfully refreshed from Google Patents.
US3216835A
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Synergistic chelate combinations in dilute immersion zincate solutions for treatment of aluminum and aluminum alloys
Assignee: MacDermid Enthone Inc
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Filing: 1960-10-06
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Granted: 1965-11-09
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Expires: 1980-10-06
Abstract
No abstract record available.
Inventors
- 👤 Edward B Saubestre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:24
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C25; C25D; C25D5/00; C25D5/34; C25D5/42; C25D5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A ZINCATING BATH FOR ALUMINUM METALS COMPRISING A DILUTE AQUEOUS SOLUTION OF A ZINC SALT HAVING A TOTAL SALT CONCENTRATION OF NO MORE THAN ABOUT 180 GRAMS PER LITER, AN ALKALINE COMPOUND AND A CHELATING REAGENT CAPABLE OF CHELATING BOTH ALUMINUM AND ZINC CONSISTING ESSENTIALLY OF THE COMBINATION OF (1) FROM ABOUT 5 TO 95 PERCENT BY WEIGHT OF A WATER SOLUBLE CHELATING AGENT HAVING A LONG K1 ZINC STABILITY CONSTANT OF ABOUT 4.5 TO 18 AND (2) FROM ABOUT 95 TO 5 PERCENT BY WEIGHT OF A WATER SOLUBLE CHELATING AGENT HAVING A LOG K1 ZINC STABILITY CONSTANT OF ABOUT 1.5 TO 4.
Claim 2
Dependent Claim
104 words
A ZINCATING BATH FOR ALUMINUM METALS COMPRISING A DILUTE AQUEOUS SOLUTION OF A ZINC SALT HAVING A TOTAL SALT CONCENTRATION OF NO MORE THAN ABOUT 180 GRAMS PER LITER, AN ALKALINE COMPOUND AND A CHELATING REAGENT CAPABLE OF CHELATING BOTH ALUMINUM AND ZINC CONSISTING ESSENTIALLY OF THE COMBINATION OF (1) FROM ABOUT 5 TO 95 PERCENT BY WEIGHT OF A WATER SOLUBLE CHELATING AGENT HAVING A LONG K1 ZINC STABILITY CONSTANT OF ABOUT 4.5 TO 18 AND (2) FROM ABOUT 95 TO 5 PERCENT BY WEIGHT OF A WATER SOLUBLE CHELATING AGENT HAVING A LOG K1 ZINC STABILITY CONSTANT OF ABOUT 1.5 TO 4.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |