http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1207656-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ce2e0e78c795a99c0246ad1b83768287 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B47-06 |
| filingDate | 1983-03-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1986-07-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e5193c131d34ce753eb76774d7d61f4f |
| publicationDate | 1986-07-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1207656-A |
| titleOfInvention | Apparatus for well logging while drilling |
| abstract | ABSTRACT A monostable, solenoid-operated valve in a passage which bypasses the drilling fluid pressure drop across a drill bit at the lower end of a drill string in a well opens and closes in response to downhole conditions to create pressure pulses in the drilling fluid. The valve is urged toward a closed position by drilling fluid pumped through the drill string. A larger force is required to open the valve than to hold it open. Current supplied to the solenoid to open the valve is thereafter reduced to a value sufficient to hold the valve open. The solenoid is de-energized to close the valve. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-112593929-A |
| priorityDate | 1983-03-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 23.