Inventor
METCALF MAX A
US14 patents
Patents
14 patentsUS9834995B2Dec 5, 2017
Horizontal directional drill pipe drive connection with locking feature
CHARLES MACHINE WORKS4 citations83
US10724347B2Jul 28, 2020
Virtual brake system
CHARLES MACHINE WORKS5 citations81
US11686180B2Jun 27, 2023
Virtual brake system
CHARLES MACHINE WORKS2 citations70
US11118430B2Sep 14, 2021
Virtual brake system
CHARLES MACHINE WORKS2 citations70
US10808466B2Oct 20, 2020
Pipe handling assembly
CHARLES MACHINE WORKS4 citations70
US10557332B2Feb 11, 2020
Spindle brake logic
CHARLES MACHINE WORKS1 citations70
US12215586B2Feb 4, 2025
Apparatus for capturing axial force on an inner drive member
CHARLES MACHINE WORKS0 citations61
US11708724B2Jul 25, 2023
Apparatus for capturing axial force on an inner drive member
CHARLES MACHINE WORKS0 citations61
US11391100B2Jul 19, 2022
Pipe storage box
CHARLES MACHINE WORKS0 citations61
US12116855B2Oct 15, 2024
Virtual brake system
CHARLES MACHINE WORKS0 citations59
US11708725B2Jul 25, 2023
Drill string rotation brake
CHARLES MACHINE WORKS0 citations55
US11041342B2Jun 22, 2021
Drill string rotation brake
CHARLES MACHINE WORKS0 citations55
US10851599B2Dec 1, 2020
Horizontal directional drill pipe drive connection with locking feature
CHARLES MACHINE WORKS0 citations51
US10407991B2Sep 10, 2019
Drill string rotation brake
CHARLES MACHINE WORKS0 citations45