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Inventor

HYLAND CRAIG R

US12 patents
⚠️ This page may combine multiple inventors who share the name “HYLAND CRAIG R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

(unassigned)

4 patents
US6216804B1Apr 17, 2001

Apparatus for recovering core samples under pressure

92 citations98
US6378631B1Apr 30, 2002

Apparatus for recovering core samples at in situ conditions

53 citations95
US6305482B1Oct 23, 2001

Method and apparatus for transferring core sample from core retrieval chamber under pressure for transport

48 citations95
US6230825B1May 15, 2001

Apparatus for recovering core samples under pressure

35 citations95

CHRISTENSEN INC NORTON

3 patents
US4904228AFeb 27, 1990

Universal ball joint

CHRISTENSEN INC NORTON109 citations94
US4580635AApr 8, 1986

Automatic drill pipe inside wiper

CHRISTENSEN INC NORTON26 citations92
US4552229ANov 12, 1985

Externally powered core catcher

CHRISTENSEN INC NORTON25 citations82

CHRISTENSEN INC

2 patents
US4429741AFeb 7, 1984

Self powered downhole tool anchor

CHRISTENSEN INC266 citations98
US4356872ANov 2, 1982

Downhole core barrel flushing system

CHRISTENSEN INC35 citations92

TERRA TEK INC

1 patent
US5322019AJun 21, 1994

System for the initiation of downhole explosive and propellant systems

TERRA TEK INC138 citations97

JAPAN NAT OIL CORP

1 patent
US6659204B2Dec 9, 2003

Method and apparatus for recovering core samples under pressure

JAPAN NAT OIL CORP52 citations95

EASTMAN CHRISTENSEN CO

1 patent
US4878548ANov 7, 1989

Nozzle retention system for a drill bit

EASTMAN CHRISTENSEN CO23 citations77