| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5fb9798bf05293ffe6d2e0fde58c3cdb |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-51
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-54
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2006-42
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-03
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-64
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-62 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B5-70642
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01G49-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B82Y30-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01G49-08 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B5-706
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G49-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G49-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G49-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01F1-11 |
| filingDate |
1991-07-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0cf159e06b02e5bd5c77a7cc60bf5cf0
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c3638d301dc4c8644968f5df96d77f65
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_277c1801707e24cd3e3dd9f13a7e417b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_80573e350bb3b529b9a361af9ecb0a91
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6ebebf2968c0a2b5330a18d031305af9
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_97ffe76825e3150a1e3face1a4bd25f6
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b71a9eea26b19cf2c7fb2da6033bc33b |
| publicationDate |
1992-12-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0515749-A2 |
| titleOfInvention |
Process for producing acicular goethite particles and acicular magnetic iron oxide particles |
| abstract |
Acicular goethite particles are produced byn (i) reacting an aqueous ferrous salt solution with less than one equivalent of an aqueous alkali hydroxide solution and/or an aqueous alkali carbonate solution based on Fe²⁺ in said aqueous ferrous salt solution; (ii) blowing a molecular oxygen-containing gas into the ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates thus obtained so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite nucleus particles; (iii) adding to the resultant aqueous ferrous salt reaction solution containing said acicular goethite nucleus particles not less than one equivalent of an aqueous alkali carbonate solution based on Fe²⁺ in said aqueous ferrous salt reaction solution; and (iv) blowing a molecular oxygen-containing gas into the resulting mixed aqueous ferrous salt reaction solution so as to cause said goethite nucleus particles to grow. Acicular magnetic iron oxide particles may be formed by reducing the acicular goethite particles obtained to produce acicular magnetite particles and, if necessary, the acicular magnetite particles obtained may be oxidised to produce acicular maghemite particles. Also if necessary, the acicular magnetite or maghemite particles may be modified with Co or Co and Fe²⁺. |
| priorityDate |
1991-05-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |