| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f513e4877801eb6a96b2021966a2bda9
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2cd4494a611e1ab2b39b53e67d6f6ce7
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_53ad76a844a1234c88af59815128770d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e7a137f1fc42665892f5fb67b78c91b5 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B17-1064 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B17-10 |
| filingDate |
2001-02-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bb9dfce0d77d2005d0348571ec613a9d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5c859220a303aff58690dcb660c23df6
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e487f01bbec838d41097ba934f89372a |
| publicationDate |
2001-08-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
WO-0159249-A2 |
| titleOfInvention |
Drill pipe torque-reduction and protection apparatus |
| abstract |
A torque-reduction and/or protection device for use in a drill string comprises a generally cylindrical body (10) including a mandrel portion (18) and a rotatable collar (20) mounted on the mandrel portion between first and second shoulders (22, 24), one of which is defined by a ring member (24) secured to said body after the collar has been located. A low friction bearing is provided between the collar and the mandrel including at least one of the following on the bearing surfaces of each of the collar and mandrel: low friction alloy coating; low friction ceramic coating; low friction alloy insert; low friction ceramic insert; magnetic elements. The collar has a low friction coating (30) on its outer surface comprising a composite coating having an inner layer of hard low friction material and an outer coating of relatively softer low friction material. The device may be incorporated into a sub but is preferably incorporated in a tool joint of a length of drill pipe. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11352840-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2606714-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2016169593-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10294734-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1291486-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2022238562-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9598913-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8863834-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2407596-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2326790-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1788104-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7409758-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2010118186-A3
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2017025643-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2326790-A4
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2407596-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-113464064-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-113464064-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/AU-2009283227-A1 |
| priorityDate |
2000-02-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |