US3595765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the electrolytic regeneration of reduced chromium compounds
Assignee: GREAT LAKES CARBON CORP
•
Filing: 1968-08-07
•
Granted: 1971-07-27
•
Expires: 1988-08-07
Abstract
Abstract AN ELECTROLYTIC PROCESS FOR THE CONTINUOUS CONVERSION OF REDUCED CHROMIUM VALUES TO THE HEXAVALENT FORM, WHICH CONSISTS IN SUBJETING AN AQUEOUS SULFURIC ACID SOLUTION OF REDUCED CHROMIUM TO THE ACTION OF DIRECT CURRENT VOLTAGE APPLIED IN SERIES TO A MULTI-UNIT FILTER PRESS TYPE CELL ASSEMBLED FROM CHROMIC ACID RESISTANT MATERIAL, LEAD ELECTRODES AND POLYTETRAHALOETHYLENE DIAPHRAGMS HAVING A PORSITY OF ABOUT 40% AND A PORE DIAMATER PREFERABLY WITHIN THE RANGE OF 50 TO 150 MICRONS.
Inventors
- 👤 Louis A Joo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:00
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/06; C25C1/10; C25D; C25D21/00; C25D21/16; C25D21/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |