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US3342588A
Expired / Lapsed
US
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Purification of iron
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1966-11-30
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Granted: 1967-09-19
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Expires: 1986-11-30
Abstract
No abstract record available.
Inventors
- 👤 Mason Ralph Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:43
CPC Classifications
C; C21; C21B; C21B15/00; C21B15/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR PURIFYING A MIXTURE OF PARTICLES OF IRON AND IMPURITIES COMPRISING FORMING AMOVING BED OF SAID PARTICLES, ADDING THE MIXTURE TO THE TOP OF THE BED, PASSING CARBON MONOXIDE-CONTAINING GAS UPWARDLY THROUGH THE BED AT A RATE SUFFICIENT TO MAINTAIN SAID PARTICLES AS A MOVING BED BUT INSUFFICIENT TO FLUIDIZE THE BED, REACTING THE IRON AND CARBON MONOXIDE TO FORM IRON CARBONYL, WITHDRAWING SAID IMPURITIES FROM THE BOTTOM OF THE MOVING BED, AND
Claim 2
Dependent Claim
75 words
A PROCESS FOR PURIFYING A MIXTURE OF PARTICLES OF IRON AND IMPURITIES COMPRISING FORMING AMOVING BED OF SAID PARTICLES, ADDING THE MIXTURE TO THE TOP OF THE BED, PASSING CARBON MONOXIDE-CONTAINING GAS UPWARDLY THROUGH THE BED AT A RATE SUFFICIENT TO MAINTAIN SAID PARTICLES AS A MOVING BED BUT INSUFFICIENT TO FLUIDIZE THE BED, REACTING THE IRON AND CARBON MONOXIDE TO FORM IRON CARBONYL, WITHDRAWING SAID IMPURITIES FROM THE BOTTOM OF THE MOVING BED, AND
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |