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DUDDELL WILLIAM DU BOIS

Overview
  • Total Patents
    11
About

DUDDELL WILLIAM DU BOIS has a total of 11 patent applications. Its first patent ever was published in 1899. It filed its patents most often in United Kingdom. Its main competitors in its focus markets transport are THOMPSON SILVANUS PHILLIPS, DOLTER HENRI and ZHEJIANG WANGLONG RAIL TRANSIT FACILITIES CO LTD.

Patent filings in countries

World map showing DUDDELL WILLIAM DU BOISs patent filings in countries
# Country Total Patents
#1 United Kingdom 11

Patent filings per year

Chart showing DUDDELL WILLIAM DU BOISs patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Transport

Focus technologies

Top inventors

# Name Total Patents
#1 Duddell William Du Bois 11
#2 Mather Thomas 4
#3 Sparks Charles Pratt 1
#4 Partridge Gerald William 1

Latest patents

Publication Filing date Title
GB191115597A Improvements in or relating to the Contact Conductors of Electric Traction Systems.
GB190402948A Improvements in Wattmeters
GB190228828A A New or Improved Method of Protecting Electric Cables or other Apparatus connected thereto from the Effects of Current Surgings.
GB190224546A An Improved Phonograph
GB190200185A Improvements in Electric Resistances.
GB190122899A Improvements in Wattmeters
GB190105171A Improvements in Non-inductive Resistances
GB190104820A Improvements in Switching Apparatus for Electric Circuits.
GB190021629A Improvements in and connected with Means for the Conversion of Electrical Energy, Derived from a Source of Direct Current, into Varying or Alternating Currents
GB190017642A A New or Improved Instrument for Measuring Direct or Alternating Electric Currents and Potential Differences.
GB189907654A A Method of and Apparatus for Starting Alternating Current Electro-motors or Bringing them up to Synchronism.