Patent US4543197A successfully refreshed from Google Patents.
US4543197A
Expired / Lapsed
US
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Process for producing magnetic metallic oxide
Assignee: Magune Co Ltd
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Filing: 1983-04-25
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Granted: 1985-09-24
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Expires: 2003-04-25
Abstract
Abstract A process for producing magnetic metallic oxide which comprises the steps of pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, adding to the substance thus pulverized at least one member selected from the group consisting of oxides of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating, wet pulverizing and mixing the mixture upon oxidation, thereby producing a slurry, and heating said slurry at 800° to 1450° C. By this process, a magnetic ferrite can be stably and inexpensively synthesized.
Inventors
- 👤 Tadayoshi Karasawa
- 👤 Katsumi Kawano
- 👤 Katsuji Uchiyama
- 👤 Michio Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:46
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; C; C01; C01G; C01G1/00; C01G1/02; C01G49/00; C01G49/0018; C01G49/0036; C01G49/0063; C01G49/0072; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
159 words
A process for producing magnetic metallic oxide comprising the steps of: pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electroytic iron and electrolytic zinc, wherein said ferro-manganese and said ferro-nickel have a carbon content of at least 3% and said electrolytic manganese, said electrolytic iron and said electrolytic zinc are of high plurity, adding to said pulverized material at least one member selected from the group consisting of oxides of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating, ventilating the mixture with a gas containing oxygen and adding an aqueous solution containing at least one of an oxidizer and an acid radical, wet pulverizing and mixing the mixture upon oxidation of said pulverized material, thereby producing a slurry, and dehydrating, drying, and heating said slurry at 800° to 1450° C. to oxidize and calcine said slurry.
Claim 2
Dependent Claim
159 words
A process for producing magnetic metallic oxide comprising the steps of: pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electroytic iron and electrolytic zinc, wherein said ferro-manganese and said ferro-nickel have a carbon content of at least 3% and said electrolytic manganese, said electrolytic iron and said electrolytic zinc are of high plurity, adding to said pulverized material at least one member selected from the group consisting of oxides of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating, ventilating the mixture with a gas containing oxygen and adding an aqueous solution containing at least one of an oxidizer and an acid radical, wet pulverizing and mixing the mixture upon oxidation of said pulverized material, thereby producing a slurry, and dehydrating, drying, and heating said slurry at 800° to 1450° C. to oxidize and calcine said slurry.
Claim 3
Dependent Claim
151 words
A process for producing magnetic metallic oxide comprising the steps of: pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, wherein said ferro-manganese and said ferro-nickel have a carbon content of at least 3% and said electrolytic manganese, said electrolytic iron and said electrolytic zinc are of high purity, adding water to said pulverized material and ventilating the mixture with a gas containing oxygen to wet pulverize and oxidize said pulverized material, adding to the pulverized material at least one member selected from the group consisting of oxides of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating; wet pulverizing and mixing the mixture, thereby producing a slurry, dehydrating, drying and heating said slurry at 800° to 1450° C. to oxidize and calcine said slurry.
Claim 4
Dependent Claim
151 words
A process for producing magnetic metallic oxide comprising the steps of: pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, wherein said ferro-manganese and said ferro-nickel have a carbon content of at least 3% and said electrolytic manganese, said electrolytic iron and said electrolytic zinc are of high purity, adding water to said pulverized material and ventilating the mixture with a gas containing oxygen to wet pulverize and oxidize said pulverized material, adding to the pulverized material at least one member selected from the group consisting of oxides of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating; wet pulverizing and mixing the mixture, thereby producing a slurry, dehydrating, drying and heating said slurry at 800° to 1450° C. to oxidize and calcine said slurry.
Claim 5
Dependent Claim
28 words
The process according to claim 1, wherein said slurry contains 36 to 60 mol % of Fe 2 O 3 and a residue of a non-iron metal oxide.
Claim 6
Dependent Claim
32 words
The process according to claim 1, wherein said ferro-manganese and said ferro-nickel are pulverized to 6 to 300 mesh, and are abruptly heated at from 900° to 1000° C. to remove carbon.
Claim 7
Dependent Claim
71 words
The process according to claim 1, wherein in the wet pulverizing and mixing step upon oxidation of said pulverized material, water or an aqueous solution which contains at least one of oxygen, hydrogen peroxide, manganese peroxide or its salt, nitric acid, nitrous acid or its salt, sulfuric acid or its salt, NH 4 NO 3 , FeSO 4 and H 2 S is added and the mixture is pulverized and oxidized.
Claim 8
Dependent Claim
54 words
The process according to claim 1, wherein said at least one member selected from the group consisting of oxides of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts and of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating, comprise 50 to 98 weight % of the mixture.
Claim 9
Dependent Claim
29 words
The process according to claim 1, wherein said slurry is calcined at 700° to 1250° C., is repulverized and heated at a temperature of from 800° to 1450° C.
Claim 10
Dependent Claim
41 words
The process according to claim 1, wherein said slurry contains 0.01 to 0.5% of at least one member selected from the group consisting of V 2 O 5 , TiO 2 , Al 2 O 3 , SiO 2 and CaO.
Claim 11
Dependent Claim
17 words
The process according to claim 1, wherein said pulverizing and wet pulverizing steps employ a ball mill.
Claim 12
Dependent Claim
55 words
The process according to claim 2, wherein in the wet pulverizing step upon oxidation of at least one selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, water or solution containing oxide or acid radical is added, and the mixture is pulverized to less than 10 microns in diameter.
Claim 13
Dependent Claim
31 words
The process according to claim 9, wherein the pulverizing media in said ball mill comprise at least one selected from the group coonsisting of ferro-manganese, ferro-nickel, electrolytic iron and electrolytic manganese.
Claim 14
Dependent Claim
24 words
The process according to claim 11, wherein said ferro-manganese in said pulverizing media is 40 to 90 wt% of substantially 5 mm in diameter.
Claim 15
Dependent Claim
161 words
A process for producing magnetic metallic oxide comprising the steps of: pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, wherein said ferro-manganese and said ferro-nickel have a carbon content of at least 3% and said electrolytic manganese, said electrolytic iron and said electrolytic zinc are of high purity, adding to said pulverized material a solution containing at least one member selected from the group consisting of an oxidizer and an acid radical to wet pulverize and oxidize said pulverized material, adding to said pulverized material at least one member selected from the group consisting of oxidies of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating, wet pulverizing and mixing the mixture, thereby producing a slurry, and dehydrating, drying and heating said slurry at 800° to 1450° C. to oxidize and calcine said slurry.
Claim 16
Dependent Claim
161 words
A process for producing magnetic metallic oxide comprising the steps of: pulverizing at least one member selected from the group consisting of ferro-manganese, ferro-nickel, electrolytic manganese, electrolytic iron and electrolytic zinc, wherein said ferro-manganese and said ferro-nickel have a carbon content of at least 3% and said electrolytic manganese, said electrolytic iron and said electrolytic zinc are of high purity, adding to said pulverized material a solution containing at least one member selected from the group consisting of an oxidizer and an acid radical to wet pulverize and oxidize said pulverized material, adding to said pulverized material at least one member selected from the group consisting of oxidies of Fe, Mn, Ni, Cu, Mg, Zn and Co and salts of Fe, Mn, Ni, Cu, Mg, Zn and Co which become oxides by heating, wet pulverizing and mixing the mixture, thereby producing a slurry, and dehydrating, drying and heating said slurry at 800° to 1450° C. to oxidize and calcine said slurry.
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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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |