JAPAN DRILLING CO., LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 393
 
  
 
B23K SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM 192
 
  
 
E02F DREDGING; SOIL-SHIFTING 144
 
  
 
E21C MINING OR QUARRYING121

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8474519 Methane hydrate dissociation accelerating and methane gas deriving systemJul 14, 08Jul 02, 13[E21B]
8256530 Method of processing rock with laser and apparatus for the sameDec 18, 07Sep 04, 12[E21B]
7802384 Method and device for excavating submerged stratumMar 16, 06Sep 28, 10[A61N, E02F, E21C]
6870128 Laser boring method and systemJun 10, 02Mar 22, 05[B23K]
6217258 Dual hoist derrick system for deep sea drillingSep 22, 97Apr 17, 01[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6386299 Method and apparatus for reaming pilot holeExpiredAug 08, 00May 14, 02[E21B]
4729746 Buoy having excellent resistance against external pressureExpiredApr 13, 87Mar 08, 88[B63B]

Top Inventors for This Owner

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