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ELECTRIC MACHINERY MFG CO

Overview
  • Total Patents
    137
About

ELECTRIC MACHINERY MFG CO has a total of 137 patent applications. Its first patent ever was published in 1919. It filed its patents most often in United States, Canada and United Kingdom. Its main competitors in its focus markets electrical machinery and energy, materials and metallurgy and basic communication technologies are HIRST JOHN ARTHUR, ADAMS MFG CO LTD and SOC D CONST ELECTR.

Patent filings in countries

World map showing ELECTRIC MACHINERY MFG COs patent filings in countries
# Country Total Patents
#1 United States 81
#2 Canada 37
#3 United Kingdom 13
#4 Switzerland 3
#5 France 2
#6 Germany 1

Patent filings per year

Chart showing ELECTRIC MACHINERY MFG COs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Swanson Edwin W 19
#2 Crownover Joseph W 16
#3 Truman Hibbard Charles 11
#4 Hibbard Charles Truman 9
#5 Schlicher David W 9
#6 Early Rupert N 8
#7 Smith Forest D 7
#8 Carter William R 5
#9 Rohner Thomas G 4
#10 Smith F 3

Latest patents

Publication Filing date Title
US4284943A Apparatus and method for controlling the speed of an induction motor in a closed-loop system
US4233643A Electrical power switching apparatus with sliding fuse drawer and interlock system
US4114019A Welding of laminations of core-plated silicon steel
US4065703A Pulse excitation torque amplifier
US4109978A Electrically insulated sleeve bearing and method of making same
US4104689A Vacuum contactor protector
US3899731A Voltage regulator with controlled current
US3838303A Mounting apparatus for disc-type semiconductors
US3794846A Automatic synchronizing control system
US3824857A Temperature measuring system for rotating machines
US3753002A Synchronizing and transfer system
US3775666A Voltage regulator for synchronous generators
US3704403A Power supply circuit to simultaneously vary frequency and amplitude in a motor speed control
US3727123A Brushless generator field ground detection system
US3748556A A.c. motor speed control system for two individual limiting circuits therein
US3575603A Time error control for generator frequency governor
US3512405A Annunciator and control system with specific application to internal combustion engines
US3535545A Annunciator and control system with specific application to internal combustion engines
US3463987A Control for synchronous motors utilizing a permanently connected resistor across the field winding
US3492561A Voltage sustainer for malfunctioning power supplies