| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_44ff3005508304394801e265e503b811 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B5-8408
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C2204-08 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C23-0075
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C19-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C21-008
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B5-8404
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C23-009
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B5-73921
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09G1-02 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B5-73
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B5-84
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C19-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C23-00 |
| filingDate |
2009-09-29^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2013-08-07^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e0f97f5e680b7f0776db22d4eceeabe4
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8bc85a6f2b46f33cc854353b12f42c59
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_94a10ea129c1a052acc06b14874facd1
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_983a39848e0240215b721fb439ce1e0e
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_beeb94f8d042a52512c6ecd1c6c615ee |
| publicationDate |
2013-08-07^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CN-102171756-B |
| titleOfInvention |
Magnetic disc glass substrate and magnetic disc |
| abstract |
Provided are a magnetic disc substrate and a method for manufacturing the same, wherein a magnetic disc substrate has significantly few defects existing on the front surface thereof at the level in the vicinity of 0.1 nm of an arithmetic average roughness (Ra) and is suitable for a high density recording magnetic disc substrate. The magnetic disc glass substrate is characterized in that the arithmetic mean roughness (Ra) on the main front surface of the glass substrate is 0.12 nm or less at a square of 2 micrometers * 2 micrometers measured by using an atomic force microscope with the resolution of 256 * 256 pixels. The magnetic disc glass substrate is also characterized in that the number of defects which are detected to be 0.1 micrometers to 0.6 micrometers in size from a plan view and 0.5 nm to 2 nm in depth, as detected by using a deviation of wavelengths between incident light and reflective light in the case where helium neon laser light of the wavelength of 632 nm is swept while the laser light is being irradiated to the main front surface of the glass substrate, is less than 10 per 24 cm2. |
| priorityDate |
2008-09-30^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |