Patent US2733204A successfully refreshed from Google Patents.
US2733204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trf atmfimt op wrtca
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
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Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:43
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/003; C23; C23C; C23C22/00; C23C22/86; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
A PROCESS FOR RECLAIMING AQUEOUS SOLUTIONS OF HEXAVALENT CHROMIUM CONTAMINATED WITH METAL CATIONS, COMPRISING BRINGING SAID SOLUTIONS INTO REACTING CONTACT WITH A CATION EXCHANGE RESIN CONSISTING OF A SULFONATED INFUSIBLE POLYMERIZATE OF A POLYVINYL ARYL COMPOUND AT A PH OF LESS THAN 4 BUT NOT BELOW 0 TO DISPLACE THE HYDROGEN OF THE RESIN WITH THE METAL CATIONS, AND SEPARATING THE HEXAVALENT CHROMIUM SOLUTION FROM SAID RESIN IN WHICH ARE HELD THE CONTAMINANT METAL CATIONS, THUS RECLAIMING PURIFIED HEXAVALENT CHROMIUM SOLUTIONS.
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) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |