JAPAN NATIONAL OIL CORPORATION

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G01V GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS 377

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6703606 Neutron burst timing method and system for multiple measurement pulsed neutron formation evaluationAug 14, 01Mar 09, 04[G01V]
6649906 Method and apparatus for safely operating radiation generators in while-drilling and while-tripping applicationsAug 17, 01Nov 18, 03[G01V]
5804820 Method for determining density of an earth formationMar 04, 97Sep 08, 98[G01V]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6467358 Method of measuring flow rates of respective fluids constituting multiphase fluid and flow meter for multiphase flow utilizing sameExpiredOct 19, 98Oct 22, 02[G01F]
6272916 Acoustic wave transmission system and method for transmitting an acoustic wave to a drilling metal tubular memberExpiredOct 12, 99Aug 14, 01[H04H, G01V]
5389550 Organic substance analyzing method and apparatus using portable constructionExpiredNov 10, 93Feb 14, 95[G01N]
4828353 Submersible optical wet connectorExpiredJul 02, 87May 09, 89[G02B]
4756559 Swivel joint for fluid pipesExpiredDec 23, 86Jul 12, 88[F16L]

Top Inventors for This Owner

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