Assignee
HOLBERT DON R
3 granted patents·142 citations·filing 1982–1982
Technology mixE21B3
Top patents by PatentIndex Score
3 records- 0177US4456080AStabilizer method and apparatus for earth-boring operationsHOLBERT DON R·Filed 1982·Granted Jun 26, 1984·56 cites·21 claims
- 0270US4449595AMethod and apparatus for drilling a curved boreHOLBERT DON R·Filed 1982·Granted May 22, 1984·44 cites·12 claims
- 0369US4420049ADirectional drilling method and apparatusHOLBERT DON R·Filed 1982·Granted Dec 13, 1983·42 cites·15 claims
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