US2833645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of chromium oxides
Assignee: Union Carbide Corp
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Filing: 1955-08-19
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Granted: 1958-05-06
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Expires: 1975-08-19
Abstract
No abstract record available.
Inventors
- 👤 Hendrik De W Erasmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:19
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
METHOD OF REDUCING CHROMIUM OXIDE BY CARBON WHICH COMPRISES PREPARING A MIXTURE OF CHROMIC OXIDE AND A CARBONACEOUS REDUCING AGENT WHICH IS STOICHIOMETRIC IN CARBON AND OXYGEN WITH RESPECT TO THE CARBON MONOXIDEFORMING REACTION, PELLETING SAID MIXTURE, MAINTAINING THE PELLETS SO FORMED AT A TEMPERATURE OF AT LEAST 1100*C. AND BELOW THE MELTING POINT OF ANY PART OF SAID PELLETS UNTIL THE RATE OF EVOLUTION OF CARBON MONOXIDE DECREASES MARKEDLY, COOLING AND COMMINUTING THE TREATED PELLETS, READJUSTING THE COMPOSITION OF THE COMMINUTED MATERIAL, IF NECESSARY, TO OBTAIN A STOICHIOMETRICAL BALANCE BETWEEN CARBON AND OXYGEN, BLENDING THE COMMINUTED MATERIAL, PELLETING THE COMMINUTED MATERIAL, AND MAINTAINING THE PELLETS SO FORMED AT A PRESSURE LESS THAN ATMOSPHERIC AND AT A TEMPERATURE OF AT LEAST 110*C. AND BELOW THE MELTING POINT OF ANY PART OF SAID PELLETS UNTIL THE RATE OF EVOLUTION OF CARBON MONOXIDE DECREASES MARKEDLY.
Claim 2
Dependent Claim
143 words
METHOD OF REDUCING CHROMIUM OXIDE BY CARBON WHICH COMPRISES PREPARING A MIXTURE OF CHROMIC OXIDE AND A CARBONACEOUS REDUCING AGENT WHICH IS STOICHIOMETRIC IN CARBON AND OXYGEN WITH RESPECT TO THE CARBON MONOXIDEFORMING REACTION, PELLETING SAID MIXTURE, MAINTAINING THE PELLETS SO FORMED AT A TEMPERATURE OF AT LEAST 1100*C. AND BELOW THE MELTING POINT OF ANY PART OF SAID PELLETS UNTIL THE RATE OF EVOLUTION OF CARBON MONOXIDE DECREASES MARKEDLY, COOLING AND COMMINUTING THE TREATED PELLETS, READJUSTING THE COMPOSITION OF THE COMMINUTED MATERIAL, IF NECESSARY, TO OBTAIN A STOICHIOMETRICAL BALANCE BETWEEN CARBON AND OXYGEN, BLENDING THE COMMINUTED MATERIAL, PELLETING THE COMMINUTED MATERIAL, AND MAINTAINING THE PELLETS SO FORMED AT A PRESSURE LESS THAN ATMOSPHERIC AND AT A TEMPERATURE OF AT LEAST 110*C. AND BELOW THE MELTING POINT OF ANY PART OF SAID PELLETS UNTIL THE RATE OF EVOLUTION OF CARBON MONOXIDE DECREASES MARKEDLY.
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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |