Inventor
EVANS ROBERT T
US11 patents
⚠️ This page may combine multiple inventors who share the name “EVANS ROBERT T”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HALLIBURTON CO
6 patentsUS4590995AMay 27, 1986
Retrievable straddle packer
HALLIBURTON CO199 citations98
US4113012ASep 12, 1978
Reclosable circulation valve for use in oil well testing
HALLIBURTON CO121 citations96
US3976136AAug 24, 1976
Pressure operated isolation valve for use in a well testing apparatus and its method of operation
HALLIBURTON CO54 citations96
US4646829AMar 3, 1987
Hydraulically set and released bridge plug
HALLIBURTON CO62 citations92
US4278130AJul 14, 1981
Access valve for drill stem testing
HALLIBURTON CO45 citations92
US4696344ASep 29, 1987
Annulus pressure operated ratchet device
HALLIBURTON CO7 citations69