Inventor
HOLLISTER FRANK HAROLD
US11 patents
⚠️ This page may combine multiple inventors who share the name “HOLLISTER FRANK HAROLD”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NAT COUPLING CO INC
8 patentsUS10174857B2Jan 8, 2019
Subsea BOP control system with dual-action check valve
NAT COUPLING CO INC4 citations82
US10054239B2Aug 21, 2018
Subsea BOP control system with dual-action check valve
NAT COUPLING CO INC5 citations82
US9810336B2Nov 7, 2017
Subsea BOP control system with dual-action check valve
NAT COUPLING CO INC5 citations82
US10415715B2Sep 17, 2019
Subsea BOP control system with dual-action check valve
NAT COUPLING CO INC2 citations71
US11105435B2Aug 31, 2021
Subsea bop control system with dual-action check valve
NAT COUPLING CO INC0 citations60
US12173576B2Dec 24, 2024
Regulator having check valve manifold for use in subsea control circuit
NAT COUPLING CO INC1 citations59
US11905782B2Feb 20, 2024
Regulator having check valve manifold for use in subsea control circuit
NAT COUPLING CO INC0 citations59
US11085545B2Aug 10, 2021
Pilot-actuated spool valve having rod retainer
NAT COUPLING CO INC0 citations47