US3864463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of alpha Fe{hd 2{b O{HD 3{B platelets
Assignee: EIDP Inc
•
Filing: 1974-03-11
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Granted: 1975-02-04
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Expires: 1994-03-11
Abstract
Abstract Single crystal platelets of Alpha -Fe2O3 are produced by a controlled vapor phase reaction between oxygen and FeCl3 in the presence of an inert bed of particles.
Inventors
- 👤 Tze Chao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:12
CPC Classifications
C; C30; C30B; C30B25/00; C30B29/00; C30B29/10; C30B29/16; C30B29/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
126 words
IN A PROCESS FOR THE MANUFACTURE OF A-FE2O3 BY THE REACTION OF AN OXYGEN-CONTAINING GAS WITH FECL3 IN THE VAPOR PHASE AT A TEMPERATURE OF 400*-750*C. IN A STATIC BED OF INERT PARTICLES, THE IMPROVEMENT FOR PRODUCING A-FE2O3 IN PLATELET FORM HAVING A PARTICLE DIAMETER OF FROM ABOUT 2 TO 100 MICRONS AND A RATIO OF DIAMETER TO THICKNESS OF AT LEAST 4 WHEREIN THE REACTION IS EFFECTED IN THE PRESENCE OF INERT GENERALLY SPHEROIDAL PARTICLES HAVING AN AVERAGE DIAMETER NOT IN EXCESS OF 1 MM, THERE BEING PRESENT IN THE BED AN ALKALI METAL HALIDE IN AN AMOUNT 0.01 TO 10 PERCENT BASED UPON THE WEIGHT OF PARTICLES, AND THE LINEAR VELOCITY OF GAS THROUGH THE BED BEING FROM 0.3 CM/SEC. TO ABOUT 10 CM/SEC.
Claim 2
Dependent Claim
126 words
IN A PROCESS FOR THE MANUFACTURE OF A-FE2O3 BY THE REACTION OF AN OXYGEN-CONTAINING GAS WITH FECL3 IN THE VAPOR PHASE AT A TEMPERATURE OF 400*-750*C. IN A STATIC BED OF INERT PARTICLES, THE IMPROVEMENT FOR PRODUCING A-FE2O3 IN PLATELET FORM HAVING A PARTICLE DIAMETER OF FROM ABOUT 2 TO 100 MICRONS AND A RATIO OF DIAMETER TO THICKNESS OF AT LEAST 4 WHEREIN THE REACTION IS EFFECTED IN THE PRESENCE OF INERT GENERALLY SPHEROIDAL PARTICLES HAVING AN AVERAGE DIAMETER NOT IN EXCESS OF 1 MM, THERE BEING PRESENT IN THE BED AN ALKALI METAL HALIDE IN AN AMOUNT 0.01 TO 10 PERCENT BASED UPON THE WEIGHT OF PARTICLES, AND THE LINEAR VELOCITY OF GAS THROUGH THE BED BEING FROM 0.3 CM/SEC. TO ABOUT 10 CM/SEC.
Claim 3
Dependent Claim
22 words
Process according to claim 1 wherein the average diameter of the inert generally spheroidal particles is not in excess of 0.6 mm.
Claim 4
Dependent Claim
13 words
Process according to claim 1 wherein the alkali metal halide is sodium chloride.
References Cited (Backward Citations)
US3376112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |