http://rdf.ncbi.nlm.nih.gov/pubchem/patent/NO-138802-C
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3a5173a7d063a9f70ca7b5e86fc23863 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61F2310-00203 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61F2310-00293 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61F2310-00179 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61L27-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61L27-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61K6-838 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B35-447 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61C13-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61K6-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61K6-78 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B25-327 |
| classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61F2-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61L27-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B38-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61C13-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61C13-083 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61L27-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61K6-838 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B25-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-447 |
| filingDate | 1975-08-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c80da93204da5811c1a61271fa31d028 |
| publicationDate | 1978-11-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | NO-138802-C |
| titleOfInvention | PROCEDURE FOR PREPARING A POLYCRYSTALLINIC, SINTERED CERAMIC MATERIAL |
| abstract | 1522182 Calcium phosphate ceramics STERLING DRUG Inc 22 July 1975 [2 Aug 1974 7 July 1975] 30706/75 Heading C1A A polycrystalline, sintered ceramic for use as a bone or tooth substitute is made by reacting calcium ion with phosphate ions in aqueous medium at pH of 10-12 to produce a gelatinous calcium phosphate precipitate having a Ca:P molar ratio of 1À44-1À72, separating the precipitate from the solution and heating the precipitate to above 1000‹C but below the temperature at which appreciable decomposition of hydroxylapatite occurs and maintaining said temperature for a sufficient time to effect sintering and maximum densification. When the Ca:P molar ratio is in the range 1À62-1À72 a translucent, isotropic, polycrystalline hydroxylapatite having an average crystalite size of 0À2-3 microns, a density of 3À1-3À14 g/cm<SP>3</SP>, substantially no pores and having cleavage along smooth curved planes is obtained. When the Ca:P ratio is in the range 1À44-1À60, preferably 1À46-1À57 a dense isotropic two-phase ceramic is obtained comprising 14-98% hydroxylapatite and 2-86% whitlockite, said ceramic having substantially no pores and having cleavage along smooth curved planes. The reactants are preferably Ca(NO 3 ) 2 and (NH 4 ) 2 HPO 4 . 0À4-0À6% of an organic binder, e.g. collagen, may be added to the precipitate to prevent cracking during drying. Porous forms of the ceramic may be made by including 5-25% by weight of organic binders such as powdered cellulose, starch, cotton or collagen to the precipitate. Fluoride ions may be introduced into the ceramic, e.g. by standing in 0À5-5% aqueous NaF for 12 hours-5 days. |
| priorityDate | 1974-08-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 43.