Inventor
VEMULAPATI UMAMAHESWARA
CH16 patents
⚠️ This page may combine multiple inventors who share the name “VEMULAPATI UMAMAHESWARA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI ENERGY LTD
5 patentsUS12513928B2Dec 30, 2025
Bidirectional thyristor device
HITACHI ENERGY LTD0 citations50
US12464749B2Nov 4, 2025
Power semiconductor device
HITACHI ENERGY LTD0 citations50
US12426349B2Sep 23, 2025
Reverse conducting power semiconductor device and method for manufacturing the same
HITACHI ENERGY LTD0 citations48
US11967638B2Apr 23, 2024
Segmented power diode structure with improved reverse recovery
HITACHI ENERGY LTD0 citations47
US12432950B2Sep 30, 2025
Insulated gate bipolar transistor including trench Schottky electrode
HITACHI ENERGY LTD0 citations45
ABB POWER GRIDS SWITZERLAND AG
4 patentsUS11043943B2Jun 22, 2021
Switching of paralleled reverse conducting IGBT and wide bandgap switch
ABB POWER GRIDS SWITZERLAND AG6 citations71
US11031473B2Jun 8, 2021
Silicon carbide superjunction power semiconductor device and method for manufacturing the same
ABB POWER GRIDS SWITZERLAND AG1 citations60
US11056582B2Jul 6, 2021
Bidirectional phase controlled thyristor (BiPCT)—a new semiconductor device concept
ABB POWER GRIDS SWITZERLAND AG0 citations51
US11107740B2Aug 31, 2021
Power semiconductor module
ABB POWER GRIDS SWITZERLAND AG0 citations50
ABB SCHWEIZ AG
4 patentsUS10026732B2Jul 17, 2018
Bidirectional power semiconductor
ABB SCHWEIZ AG0 citations41
US10629677B2Apr 21, 2020
Area efficient floating field ring termination
ABB SCHWEIZ AG0 citations40
US10566463B2Feb 18, 2020
Power semiconductor device with floating field ring termination
ABB SCHWEIZ AG0 citations40
US10461157B2Oct 29, 2019
Flat gate commutated thyristor
ABB SCHWEIZ AG0 citations40