| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b27deaf45890893586c2ed77ac13dc32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_04ddad32093bb39938c9a4a6a7431bc0
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b9766e7273b30b54244f0e8529293220 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-265
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-264
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-13 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C22-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C22-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C22-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23C22-18 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-07
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-50
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23C22-62 |
| filingDate |
2002-02-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_aacc9c362b38c77dd42c0655e7bb9637
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fdc9a3aaf36f22a7611c137c1221bf0a |
| publicationDate |
2002-09-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
WO-02068715-A1 |
| titleOfInvention |
Surface treated steel product, method for production thereof and chemical conversion treatment solution |
| abstract |
A chemical conversion film having a specified thickness and containing a potassium compound in a specified amount is formed on the surface of a screw of a joint portion of an oil well steel pipe by using a chemical conversion treatment solution added with a potassium ion in a specified amount. The chemical conversion treatment solution allows the stable formation of a phosphate chemical conversion film on a joint portion of an oil well pipe steel product which contains 0.5 to 13 % of Cr. |
| priorityDate |
2001-02-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |