Assignee
JAPAN NAT OIL CORP
US·7 granted patents·475 citations·filing 1998–2002
Top patents by PatentIndex Score
7 records- 0195US6719074B2Insert chip of oil-drilling tricone bit, manufacturing method thereof and oil-drilling tricone bitJAPAN NAT OIL CORP·Filed 2002·Granted Apr 13, 2004·177 cites·22 claims
- 0285US6659204B2Method and apparatus for recovering core samples under pressureJAPAN NAT OIL CORP·Filed 2001·Granted Dec 9, 2003·52 cites·33 claims
- 0379US6637528B2Bit apparatusJAPAN NAT OIL CORP·Filed 2001·Granted Oct 28, 2003·62 cites·14 claims
- 0476US6272916B1Acoustic wave transmission system and method for transmitting an acoustic wave to a drilling metal tubular memberJAPAN NAT OIL CORP·Filed 1999·Granted Aug 14, 2001·74 cites·7 claims
- 0573US6467358B1Method of measuring flow rates of respective fluids constituting multiphase fluid and flow meter for multiphase flow utilizing sameJAPAN NAT OIL CORP·Filed 1998·Granted Oct 22, 2002·46 cites·19 claims
- 0663US6141395ASealed neutron tubeJAPAN NAT OIL CORP·Filed 1999·Granted Oct 31, 2000·48 cites·9 claims
- 0752US6220787B1Ship type floating oil production systemJAPAN NAT OIL CORP·Filed 1998·Granted Apr 24, 2001·16 cites·20 claims
Join the waitlist — get patent alerts
Get an alert when JAPAN NAT OIL CORP files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →