Inventor
HOWLAND JAMES
US8 patents
Patents
8 patentsUS10024341B2Jul 17, 2018
Hydraulic hybrid swing drive system for excavators
PARKER HANNIFIN CORP15 citations79
USD745112SDec 8, 2015
Hydraulic unit
PARKER HANNIFIN CORP8 citations73
US11225776B2Jan 18, 2022
Boom potential energy recovery of hydraulic excavator
PARKER HANNIFIN CORP1 citations70
US10358797B2Jul 23, 2019
Boom potential energy recovery of hydraulic excavator
PARKER HANNIFIN CORP2 citations70
US9879403B2Jan 30, 2018
Hydraulic hybrid swing drive system for excavators
PARKER HANNIFIN CORP2 citations70
US10941542B2Mar 9, 2021
Boom potential energy recovery of hydraulic excavator
PARKER HANNIFIN CORP0 citations59
US10819252B2Oct 27, 2020
Adaptive hybrid wireless power generation using piezoelectric element and power beaming in hydraulic systems
PARKER HANNIFIN CORP1 citations59
US10815646B2Oct 27, 2020
Boom potential energy recovery of hydraulic excavator
PARKER HANNIFIN CORP0 citations49