Patent US2744004A successfully refreshed from Google Patents.
US2744004A
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Method of lowering the carbon content of high carbon ferrochromium
Assignee: Chromium Mining and Smelting Corp Ltd
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Filing: 1953-01-27
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Granted: 1956-05-01
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Expires: 1973-01-27
Abstract
No abstract record available.
Inventors
- 👤 Alan R Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:16
CPC Classifications
C; C21; C21D; C21D3/00; C21D3/02; C21D3/04; B; B22; B22F; B22F1/00; B22F1/14; B22F1/145; C22; C22C; C22C33/00; C22C33/02; C22C33/0207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF LOWERING THE CARBON CONTENT OF HIGH CARBON FERROCHROMIUM WHICH COMPRISES COMMINUTING HIGH CARBON FERROCHROMIUM, ESTABLISHING A FLUIDIZED BED OF SAID HIGH CARBON FERROCHROMIUM BY BLOWING UPWARDLY THROUGH A BODY THEREOF A STREAM OF OXIDIZING GAS, MAINTAINING SAID FLUIDIZED BED AT A TEMPERATURE OF FROM 900* C. TO 1400* C. FOR A TIME SUFFICIENT TO OXIDIZED A SUBSTANTIAL PORTION OF THE CARBON AND METAL OF SAID FERROCHROMIUM AND TO REMOVE SAID CARBON FROM SAID FERROCHROMIUM AS AN OXIDE CARBON AND THEREAFTER TREATING SAID PARTIALLY OXIDIZED FERROCHROMIUM AT AN ELEVATED TEMPERATURE IN A STRONGLY REDUCING ATMOSPHERE OF REDUCING GAS FOR A TIME SUFFICIENT TO REDUCE A SUBSTANTIAL PORTION OF THE METAL OXIDE CONTENT OF THE FERROCHROMIUM TO METAL.
Claim 2
Independent Claim
119 words
A METHOD OF LOWERING THE CARBON CONTENT OF HIGH CARBON FERROCHROMIUM WHICH COMPRISES COMMINUTING HIGH CARBON FERROCHROMIUM, ESTABLISHING A FLUIDIZED BED OF SAID HIGH CARBON FERROCHROMIUM BY BLOWING UPWARDLY THROUGH A BODY THEREOF A STREAM OF OXIDIZING GAS, MAINTAINING SAID FLUIDIZED BED AT A TEMPERATURE OF FROM 900* C. TO 1400* C. FOR A TIME SUFFICIENT TO OXIDIZED A SUBSTANTIAL PORTION OF THE CARBON AND METAL OF SAID FERROCHROMIUM AND TO REMOVE SAID CARBON FROM SAID FERROCHROMIUM AS AN OXIDE CARBON AND THEREAFTER TREATING SAID PARTIALLY OXIDIZED FERROCHROMIUM AT AN ELEVATED TEMPERATURE IN A STRONGLY REDUCING ATMOSPHERE OF REDUCING GAS FOR A TIME SUFFICIENT TO REDUCE A SUBSTANTIAL PORTION OF THE METAL OXIDE CONTENT OF THE FERROCHROMIUM TO METAL.
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |