Inventor · disambiguated record

John M. Kolker

Also filed as: KOLKER JOHN M

2 granted patents·24 citations·filing 1998–2004

60Inventor score

Technology areasE21B

Files withHALLIBURTON ENERGY SERV INC1 SANDVIK AB1

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2 records

0147US7225875B2Multi-layered wellbore junctionHALLIBURTON ENERGY SERV INC·Filed 2004·Granted Jun 5, 2007·14 cites·56 claims
0223US6112835ADrilling apparatus having a radially displaceable reamerSANDVIK AB·Filed 1998·Granted Sep 5, 2000·10 cites·28 claims

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