US3238037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial magnetic oxides
Assignee: LES OXYDES FRANCAIS SA
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Filing: 1961-11-13
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Granted: 1966-03-01
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Expires: 1981-11-13
Abstract
No abstract record available.
Inventors
- 👤 Sautier Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:19
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/44; H01F1/445; B; B03; B03B; B03B1/00; B03B1/02; C; C01; C01G; C01G49/00; C01G49/02; C01G49/08; C21; C21B; C21B13/00; C21B13/006; C22; C22B; C22B1/00; C22B1/02; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
PROCESS OF PRODUCING FERROMAGNTIC OXIDES WHICH COMPRISES: STEP. 1: TREATING THE RESIDUE FROM THE ROASTING OFPYRITE, HAVING AN INITIAL GRAIN SIZE NOT EXCEEDING 10 MM., UNDER THE TEMPERATURE AND REDUCTION CONDITIONS GIVEN IN THE CHAUDRON DIAGRAM THEREBY TO FORM FERROMAGNETIC IRON OXIDE; STEP 2: SUBJECTING THE PRODUCT OF STEP 1 TO A TEMPERATURE OF 1250-1450*C. IN A REDUCING-OXIDIZING ATMOSPHERE OF CO AND CO2 WITH A REDUCTION RATIO OF AT LEAST 0.85, IN THE PRESENCE OF STEAM IN AN AMOUNT OF AT LEAST 50% BY WEIGHT OF THAT OF THE IRON CONTAINED IN THE IRON ORE; STEP 3: BRUPTLY COLING AND SIMULTANEOUSLY CRUSHING THE NODULAR PRODUCT OF STEP 2 OUT OF CONTACT OF AIR IN A CLOSED CRUSHER CONTAINING WATER AT 100*C.,
Claim 2
Dependent Claim
121 words
PROCESS OF PRODUCING FERROMAGNTIC OXIDES WHICH COMPRISES: STEP. 1: TREATING THE RESIDUE FROM THE ROASTING OFPYRITE, HAVING AN INITIAL GRAIN SIZE NOT EXCEEDING 10 MM., UNDER THE TEMPERATURE AND REDUCTION CONDITIONS GIVEN IN THE CHAUDRON DIAGRAM THEREBY TO FORM FERROMAGNETIC IRON OXIDE; STEP 2: SUBJECTING THE PRODUCT OF STEP 1 TO A TEMPERATURE OF 1250-1450*C. IN A REDUCING-OXIDIZING ATMOSPHERE OF CO AND CO2 WITH A REDUCTION RATIO OF AT LEAST 0.85, IN THE PRESENCE OF STEAM IN AN AMOUNT OF AT LEAST 50% BY WEIGHT OF THAT OF THE IRON CONTAINED IN THE IRON ORE; STEP 3: BRUPTLY COLING AND SIMULTANEOUSLY CRUSHING THE NODULAR PRODUCT OF STEP 2 OUT OF CONTACT OF AIR IN A CLOSED CRUSHER CONTAINING WATER AT 100*C.,
References Cited (Backward Citations)
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Cited
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |