Learn more

QUALITROL CORP

Overview
  • Total Patents
    166
About

QUALITROL CORP has a total of 166 patent applications. Its first patent ever was published in 1945. It filed its patents most often in United States, Canada and EPO (European Patent Office). Its main competitors in its focus markets electrical machinery and energy, measurement and machines are WABASH MAGNETICS INC, DE FREES JOSEPH H and STERLING HYDRAULICS INC.

Patent filings per year

Chart showing QUALITROL CORPs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Herz Joshua J 24
#2 Hagerman Richard E 23
#3 Foster Joseph F 21
#4 Johnson Wendell D 20
#5 Romanowski Robert F 12
#6 Ford George E 9
#7 Bodker John R 7
#8 Romanowski Robert Francis 4
#9 Billings David L 4
#10 Blythe Raymond T 4

Latest patents

Publication Filing date Title
CN101495841A Calibration liquid level monitoring measurer
US2006251147A1 Transformer temperature monitoring and control
US2006250683A1 Transformer temperature monitoring and control
US2005133093A1 Pressure relief device with increased flow rate
US2005133094A1 Enclosure system for pressure relief device
US6497248B2 Pressure relief device with one piece gasket
CA2232919A1 Multiple sensor plate assembly
US5937893A Shield for pressure relief device
SG167394G Rapid pressure rise circuit
IE890346L Gasket for cooling system of transformer
US4843187A Gasket assembly and electrical power transformer including the same
US4823224A Rapid pressure rise circuit
WO8801046A1 Hall effect liquid level sensor system
US4775245A Multi-phase electronic temperature controller
US4733974A Transformer life consumption indicator
US4754405A Tri-phase electronic temperature controller
US4717882A Snap over lens assembly
US4745571A Modular electronic temperature controller
CA1207213A Dual valve pressure relief device
IE830929L Pressure relief device