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DRUMMOND DUGALD

Overview
  • Total Patents
    30
About

DRUMMOND DUGALD has a total of 30 patent applications. Its first patent ever was published in 1894. It filed its patents most often in United Kingdom, United States and Canada. Its main competitors in its focus markets environmental technology and thermal processes are ZHEJIANG TIANDI ENVIRONMENTAL PROT ENGINEERING CO LTD, WAINWRIGHT HARRY SMITH and GUY CARPENTER.

Patent filings in countries

World map showing DRUMMOND DUGALDs patent filings in countries
# Country Total Patents
#1 United Kingdom 8
#2 United States 5
#3 Canada 4
#4 Denmark 4
#5 Austria 3
#6 Spain 3
#7 Switzerland 2
#8 France 1

Patent filings per year

Chart showing DRUMMOND DUGALDs patent filings per year from 1900 to 2020

Focus industries

Focus technologies

Top inventors

# Name Total Patents
#1 Drummond Dugald 26
#2 Dugald Drummond 1

Latest patents

Publication Filing date Title
CA138657A Train control mechanism
GB190726407A Improvements in and relating to Blast Pipe Nozzles for Locomotives and the like.
CA99690A Spark preventer for locomotives
US817474A Spark-preventer for locomotives.
US704008A Spark-preventer for locomotive or other engines.
CA74005A Spark arrester for engines
US712997A Spark-preventer for locomotive or other engines.
US712776A Spark-preventer for locomotive or other engines.
GB190113769A Spark Arrester for Locomotive and other Engines.
GB190023631A Improvements in Steam Generators of the Marine Type.
GB190023630A Improvements in Steam Generators of the Locomotive Type.
GB189906293A Apparatus for Automatically Regulating the Heating and Ventilation of Railway Carriages and Buildings.
GB189901077A Improvements in Apparatus for use in Heating Railway Carriages.
CA59168A Locomotive boiler
US629893A Locomotive-boiler.
GB189727949A Improvements in Locomotive Boilers.
GB189405119A Improvements in Apparatus for Expressing Sap or Juice from Fibrous Canes and other Materials.