Inventor
SPELLER DAVID J
US6 patents
⚠️ This page may combine multiple inventors who share the name “SPELLER DAVID J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
BAKER OIL TOOLS INC
4 patentsUS4552218ANov 12, 1985
Unloading injection control valve
BAKER OIL TOOLS INC80 citations95
US4498536AFeb 12, 1985
Method of washing, injecting swabbing or flow testing subterranean wells
BAKER OIL TOOLS INC86 citations95
US4485876ADec 4, 1984
Valving apparatus for downhole tools
BAKER OIL TOOLS INC36 citations91
US4576196AMar 18, 1986
Unloading injection control valve
BAKER OIL TOOLS INC18 citations73