Patent US2850378A successfully refreshed from Google Patents.
US2850378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of chromium by low-pressure reduction of oxides
Assignee: Individual
•
Filing: 1956-12-17
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Granted: 1958-09-02
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Hugh S Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:46
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF PRODUCING CHROMINUM METAL FROM CHROMIUM OXODE BY REDUCTION OF THE OXIDE WITH CARBON, COMPRISING INTIMATELY MIXING FINELY DIVIDED CHROMIUM OXIDE AND FINELY DIVIDED CARBON IN SUBSTANTIALLY STOICHIOMETRIC PROPORTIONS FOR COMBINATION OF ALL OF THE OXYGEN OF THE OXIDE WITH ALL OF THE CARBON TO PRODUCE CARBON MONOXIDE, HEATING SAID MIXTURE IN A REACTION CHAMBER TO AN ELEVATED TEMPERATURE ABOVE ABOUT 1200*C. BUT BELOW THE MELTING POINT OF CHROMIUM, HOLDING THE MIXUTRE AT SUCH AN ELEVATED TEMPERATURE WHILE REMOVING EVOLVED CARBON MONOXIDE AT A RATE TO CREATE AND MAINTAIN A PARTIAL SUBATMOSPHERIC PRESSURE OF NON-CONDENSABLE GAS CONSISTING ESSENTIALLY OF SAID CARBON MONOXIDE IN SAID CHAMBER, SAID PARTIAL PRESSURE BEING SUBSTANTIALLY BELOW ATMOSPHERIC PRESSURE BUT EXCEEDING THE PARTIAL VAPOR PRESSURE OF CHROMIUM AT THE PREVAILING TEMPERATURE, AND MAINTAINING SUBSTANTIALLY SAID CONDITIONS OF PRESSURE AND TEMPERATURE UNTIL REDUCTION OF THE OXIDE IS SUBSTANTIALLY COMPLETE.
Claim 2
Independent Claim
144 words
A METHOD OF PRODUCING CHROMINUM METAL FROM CHROMIUM OXODE BY REDUCTION OF THE OXIDE WITH CARBON, COMPRISING INTIMATELY MIXING FINELY DIVIDED CHROMIUM OXIDE AND FINELY DIVIDED CARBON IN SUBSTANTIALLY STOICHIOMETRIC PROPORTIONS FOR COMBINATION OF ALL OF THE OXYGEN OF THE OXIDE WITH ALL OF THE CARBON TO PRODUCE CARBON MONOXIDE, HEATING SAID MIXTURE IN A REACTION CHAMBER TO AN ELEVATED TEMPERATURE ABOVE ABOUT 1200*C. BUT BELOW THE MELTING POINT OF CHROMIUM, HOLDING THE MIXUTRE AT SUCH AN ELEVATED TEMPERATURE WHILE REMOVING EVOLVED CARBON MONOXIDE AT A RATE TO CREATE AND MAINTAIN A PARTIAL SUBATMOSPHERIC PRESSURE OF NON-CONDENSABLE GAS CONSISTING ESSENTIALLY OF SAID CARBON MONOXIDE IN SAID CHAMBER, SAID PARTIAL PRESSURE BEING SUBSTANTIALLY BELOW ATMOSPHERIC PRESSURE BUT EXCEEDING THE PARTIAL VAPOR PRESSURE OF CHROMIUM AT THE PREVAILING TEMPERATURE, AND MAINTAINING SUBSTANTIALLY SAID CONDITIONS OF PRESSURE AND TEMPERATURE UNTIL REDUCTION OF THE OXIDE IS SUBSTANTIALLY COMPLETE.
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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |