Patent US3728188A successfully refreshed from Google Patents.
US3728188A
Expired / Lapsed
US
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Chrome-free deoxidizing and desmutting composition and method
Assignee: Henkel Corp
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Filing: 1971-07-29
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Granted: 1973-04-17
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Expires: 1991-07-29
Abstract
Abstract A DEOXIDIZING AND DESMUTTING PROCESS, EMPLOYING CHROME-FREE COMPOSITIONS AND PROVIDING IMPROVED SOLUTIONS FOR TREATING ALUMINUM SURFACES, IN PREPARATION FOR SUBSEQUENT FINISHING OPERATIONS. THE INVENTION, IN BOTH ITS METHOD AND COMPOSITION ASPECTS, INVOLVES PREVENTING SMUT FORMATION ON THE DEOXIDIZED ALUMINUM SURFACE, CONTROLLING SURFACE ETCH DURING THE DEOXIDIZING PROCESS, AND PROLONGING THE EFFECTIVE LIFE OF THE AQUEOUS ACIDIC DEOXIDIZING SOLUTION.
Inventors
- 👤 R Yarrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:58
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125; C23G1/14; C23G1/22; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/109
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |