US2791489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing carbon from a mixture of barium oxide and carbon
Assignee: Columbia Southern Chemical Corp
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Filing: 1952-04-01
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Granted: 1957-05-07
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Expires: 1972-04-01
Abstract
No abstract record available.
Inventors
- 👤 Henry W Rahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:36
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/02; C01F11/04; C01F11/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A METHOD OF PREPARING BARIUM OXIDE WHICH COMPRISES CALCINING A MIXTURE OF BARIUM CARBONATE AND CARBON THEREBY PRODUCING A MIXTURE OF BARIUM OXIDE AND CARBON AND THEREAFTER IN A SEPARATE OPERATION BURNING CARBON OUT OF THE BARIUM OXIDE-CARBON MIXTURE IN A GASEOUS MIXTURE OF OXYGEN AND GAS WHICH IS INERT TO BARIUM OXIDE, SAID GASEOUS MIXTURE CONTAINING A SUBSTANTIAL AMOUNT BUT LESS THAN 15 PERCENT BY VOLUME OF OXYGEN.
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) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |