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VARIABLE SPEED GEAR LTD

Overview
  • Total Patents
    74
About

VARIABLE SPEED GEAR LTD has a total of 74 patent applications. Its first patent ever was published in 1912. It filed its patents most often in United Kingdom, France and United States. Its main competitors in its focus markets engines, pumps and turbines, mechanical elements and transport are HANS THOMA, UNIPAT AG and UNIVERSAL SPEED CONTROL COMPAN.

Patent filings in countries

World map showing VARIABLE SPEED GEAR LTDs patent filings in countries
# Country Total Patents
#1 United Kingdom 28
#2 France 18
#3 United States 12
#4 Canada 8
#5 Germany 8

Patent filings per year

Chart showing VARIABLE SPEED GEAR LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Ingoldby Maurice Kerr 6
#2 Robson John 6
#3 Kerr Ingoldby Maurice 4
#4 Dreyer John Tuthill 2
#5 Wilson Arthur 2
#6 Reavell William 1
#7 Haerle Hans 1
#8 Tuthill Dreyer John 1
#9 William Wallace 1
#10 Wallace William 1

Latest patents

Publication Filing date Title
US2225911A Hydraulic pump or motor
GB586589A Improvements in or relating to fire or like control apparatus for guns or similarly controllable devices
GB503149A Improvements in or relating to shaft packing or sealing devices
GB503150A Improvements in or relating to hydraulic pumps, motors and other apparatus embodyingmechanism of the swashplate type
GB503148A Improvements in or relating to plate valves for hydraulic pumps or motors of the swashplate type
US1947540A Control gear for variable delivery pumps
US1748606A Variable-delivery pump
FR582934A Improvements to hydraulic pumps and motors
US1507458A Endless track for vehicles
GB215829A Improvements in or relating to endless track vehicles
GB212693A Improvements in or relating to power transmission-apparatus for motor-driven vehicles
US1498876A Power-transmission device
US1424823A Hydraulic pump and motor
GB197348A Improvements in or relating to power transmission devices
GB188947A Improvements in or relating to hydraulic motors
GB172266A Improvements in or relating to hydraulic pumps and motors
GB188716A Improvements in or relating to variable speed hydraulic transmission apparatus
GB181914A Improvements in or relating to variable speed hydraulic transmission apparatus
GB181565A Improvements in or relating to variable speed hydraulic transmission devices
GB182976A Improvements in or relating to variable stroke hydraulic pumps