| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_abb1350ea0b9544ddda26ba9e0ae2dde |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04R17-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2006-80
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-61
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-50
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-62
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2002-34
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2004-03
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2002-85
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01P2002-72 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C30B7-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01G25-006
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C30B29-32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H10N30-853 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04R17-08 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01L41-187
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-49
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G25-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C30B7-00 |
| filingDate |
1989-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_72d45489b9e52017b93d31ea49fa6b93
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b624c49a74eb67af82e318658998c8c2 |
| publicationDate |
1991-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0448604-A1 |
| titleOfInvention |
Process for producing highly crystalline and homogeneous sub-micron doped and undoped piezoelectric ceramic powders with controlled stoichiometry and particle size |
| abstract |
This invention relates to a chemically homogeneous powder in solid solution, single crystals of a compound of lead perovskite zirconate titanate. A process for producing this powder consists in: (a) preparing a first acid solution containing zirconium and titanium ions, and possibly other ions; (b) preparing a second basic solution containing a sufficient concentration of hydroxide to obtain a determined pH when mixed with the first solution; (c) adding the first acid solution to the second basic solution to precipitate a substantially pure mixture of hydroxides; (d) washing the precipitate and adding a lead compound; (e) preparing an aqueous slurry of the washed precipitate and adding lead ions, and optionally other ions; (f) hydrothermally treating the sludge at an elevated temperature and pressure for a time long enough to form the powder; (g) dry the powder. |
| priorityDate |
1988-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |