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ROTOL LTD

Overview
  • Total Patents
    250
About

ROTOL LTD has a total of 250 patent applications. Its first patent ever was published in 1942. It filed its patents most often in United Kingdom, United States and Canada. Its main competitors in its focus markets transport, electrical machinery and energy and control are SIKORSKY AIRCRAFT CORP, AGUSTA SPA and CURTISS MOTOR COMPANY.

Patent filings in countries

World map showing ROTOL LTDs patent filings in countries
# Country Total Patents
#1 United Kingdom 76
#2 United States 59
#3 Canada 52
#4 France 50
#5 Germany 13

Patent filings per year

Chart showing ROTOL LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Chilman John Alfred 32
#2 Alfred Chilman John 19
#3 Chilman John A 14
#4 Godden Thomas Edward 14
#5 Morris Edward Hollingworth 13
#6 Cripps John 13
#7 Mapp Alfred George 11
#8 Fairhurst Leonard Gaskell 8
#9 George Mapp Alfred 8
#10 Danvers Ellis 8

Latest patents

Publication Filing date Title
US2995190A Impellers
US2982499A Aircraft undercarriages
US3016911A Fluid operated prime movers
US3010682A Aircraft undercarriages
DE1116004B Control valve with two closure parts in one housing
US2967033A Aircraft undercarriage
US2972087A Phasing apparatus
US2999463A Variable-delivery multi-stage hydraulic pumps
GB848526A Fluid operated prime mover
US3040817A Variable pitch propellers
GB858563A Improvements in or relating to methods and apparatus for reconditioning thrust bearing races
GB840599A Improvements in or relating to overspeed limiting devices for rotary systems
GB849985A Improvements in or relating to aircraft undercarriages
GB847684A Improvements in or relating to undercarriage arrangements for rotary wing aircraft
US3017932A Control systems for aircraft propellers
GB868121A Improvements in or relating to speed governors
US2994385A Control systems for aircraft propellers
GB873616A Improvements in or relating to speed governors
US2982137A Speed governors
US3024848A Hydraulic variable pitch propellers