US3578469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of ferrous sulfate from nickel baths
Assignee: Eagle Picher Industries Inc
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Filing: 1969-03-24
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Granted: 1971-05-11
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Expires: 1989-03-24
Abstract
Abstract PROCESS FOR THE REMOVAL OF FERROUS SULFATE FROM NICKEL PLATING SOLUTIONS WHICH INVOLVES ADDING HYDROGEN PEROXIDE TO THE SOLUTION AND ADJUSTING THE PH TO A VALUE OF ABOUT 3.1 TO 3.3 TO THEREBY PRECIPITATE FERRIC SULFATE IN A FORM WHICH CAN BE READILY REMOVED FROM THE REMAINDER OF THE SOLUTION BY FILTRATION.
Inventors
- 👤 Richard N Hudd
- 👤 Heinz Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:13
CPC Classifications
C; C25; C25D; C25D21/00; C25D21/16; C25D21/18
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |