US3305463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic production of dichromates
Assignee: PPG Industries Inc
•
Filing: 1962-03-16
•
Granted: 1967-02-21
•
Expires: 1982-03-16
Abstract
No abstract record available.
Inventors
- 👤 William W Carlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:06
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/14; C25; C25B; C25B1/00; C25B1/01; C25B1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR PRODUCING SODIUM DICHROMATE WHICH COMPRISES FEEDING AN AQUEOUS SOLUTION OF SODIUM CHROMATE HAVING A CRO3 CONTENT OF BETWEEN 50 TO 550 GRAMS PER LITER TO THE ANODE COMPARTMENT OF AN ELECTROLYTIC CELL HAVING AN ANODE AND A CATHODE COMPARTMENT, PROVIDING IN SAID CELL A PERMIONIC MEMBRANE WHICH DIVIDES THE CELL INTO TWO SECTIONS, ONE SECTION CONTAING THE CELL ANODE, THE OTHER SECTION CONTAINING THE CELL CATHODE, SAID PERMIONIC MEMBRANCE BEING IMPERVIOUS TO THE PASSAGE OF CHROMATE IONS, FEEDING WATER TO THE CATHODE SECTION OF SAID CELL, ELECTROLYZING THE CELL CONTENTS AND WITHDRAWING ANOLYTE FROM THE ANODE SECTION OF THE CELL WHEN THE PH OF THAT ANOLYTE REACHES A VALUE BETWEN 1.5 AND 5.
Claim 2
Dependent Claim
116 words
A PROCESS FOR PRODUCING SODIUM DICHROMATE WHICH COMPRISES FEEDING AN AQUEOUS SOLUTION OF SODIUM CHROMATE HAVING A CRO3 CONTENT OF BETWEEN 50 TO 550 GRAMS PER LITER TO THE ANODE COMPARTMENT OF AN ELECTROLYTIC CELL HAVING AN ANODE AND A CATHODE COMPARTMENT, PROVIDING IN SAID CELL A PERMIONIC MEMBRANE WHICH DIVIDES THE CELL INTO TWO SECTIONS, ONE SECTION CONTAING THE CELL ANODE, THE OTHER SECTION CONTAINING THE CELL CATHODE, SAID PERMIONIC MEMBRANCE BEING IMPERVIOUS TO THE PASSAGE OF CHROMATE IONS, FEEDING WATER TO THE CATHODE SECTION OF SAID CELL, ELECTROLYZING THE CELL CONTENTS AND WITHDRAWING ANOLYTE FROM THE ANODE SECTION OF THE CELL WHEN THE PH OF THAT ANOLYTE REACHES A VALUE BETWEN 1.5 AND 5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |