Patent US3002815A successfully refreshed from Google Patents.
US3002815A
Expired / Lapsed
US
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Process for the production of chromium trioxide
Assignee: Bayer AG
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Filing: 1959-07-01
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Granted: 1961-10-03
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Expires: 1979-07-01
Abstract
No abstract record available.
Inventors
- 👤 Heinze Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:57
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/02; C01G37/033; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A PROCESS FOR THE PRODUCTION OF CHROMIUM TRIOXIDE BY REACTING SODIUM DICHROMATE WITH SULPHURIC ACID, THE STEP WHICH COMPRISES REACTING A MIXTURE OF DICHROMATE AND WATER CONTAINING ABOUT 1300G. TO ABOUT 1700G. OF DICHROMATE (CALCULATED AS NA2CR2O7,2H2O) PER LITRE WITH FROM 2 TO 2.6 MOLS OF SULPHURIC ACID PER MOL OF DICHROMATE, AND RECOVERING THE CHROMIUM TRIOXIDE FORMED FROM THE RESULTING REACTION MIXTURE.
Claim 2
Dependent Claim
64 words
IN A PROCESS FOR THE PRODUCTION OF CHROMIUM TRIOXIDE BY REACTING SODIUM DICHROMATE WITH SULPHURIC ACID, THE STEP WHICH COMPRISES REACTING A MIXTURE OF DICHROMATE AND WATER CONTAINING ABOUT 1300G. TO ABOUT 1700G. OF DICHROMATE (CALCULATED AS NA2CR2O7,2H2O) PER LITRE WITH FROM 2 TO 2.6 MOLS OF SULPHURIC ACID PER MOL OF DICHROMATE, AND RECOVERING THE CHROMIUM TRIOXIDE FORMED FROM THE RESULTING REACTION MIXTURE.
References Cited (Backward Citations)
US2034256A
Cited
US2632688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |