| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ddf192fb12b053f26ef87f0a7d662bb3
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_cdc7ec497b6b45e5a5061367ecdc2196
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_94c0ae7b1a4552ae37069a3d3ce19f80
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_82e6a2464164640a93f197c0bc597155
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0e7b522b71fd001f1a633fd8563b2a3e |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-31692
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-1352
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-1355
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-31801
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-31826
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-31913
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-31717
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-31938 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B17-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F16L9-14 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B17-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F16L9-14 |
| filingDate |
1998-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c5881b4a0644ed1ad223785bfc8af1c3
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_acef3905a7eb17605599cb275b164e1a
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_51d515e3d09979ebb24580d0075f6484
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0fca74573f6e8867ffe561a1a9548e17 |
| publicationDate |
1999-02-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
WO-9905440-A1 |
| titleOfInvention |
Oil well pipe |
| abstract |
An oil well pipe formed so that it is rarely broken even by ground subsidence, by providing a slide layer on an outer portion of an oil well pipe body and thereby reducing a frictional force exerted on the oil well pipe, characterized in that the slide layer is formed out of such a material and to such a thickness that a residual negative frictional force determined after the slide layer has been used and deformed for one year at a temperature at which the oil well pipe has been used does not exceed 2x103N/m2, or out of such a material that a stiffness coefficient (S(t)) determined after the slide layer has been used and deformed for one year at a temperature at which the oil well pipe has been used ranges from 10?-5N/m2 to 103N/m2¿, the oil well pipe having an adhesive layer between the pipe body and the slide layer, whereby restricting values of physical properties of the slide layer in this manner to reduce the occurrence of a sliding phenomenon during an oil well pipe laying operation, improve the adhesion of the slide layer and oil well pipe body, and to prevent the breakage of the slide layer due to a physical impact which the oil well pipe receives from the outside during the transportation or the laying of the oil well pipe and a decrease in a frictional force reducing effect by employing a protective layer on the slide layer. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7129267-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10576149-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9475883-B2 |
| priorityDate |
1997-07-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |