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DUFAY LOUIS

Overview
  • Total Patents
    21
About

DUFAY LOUIS has a total of 21 patent applications. Its first patent ever was published in 1908. It filed its patents most often in Canada, Switzerland and Spain. Its main competitors in its focus markets optics are RUTH RUDOLF, CHRISTENSEN JENS HERMAN and JENS HERMAN CHRISTENSEN.

Patent filings in countries

World map showing DUFAY LOUISs patent filings in countries

Patent filings per year

Chart showing DUFAY LOUISs patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Optics

Top inventors

# Name Total Patents
#1 Dufay Louis 13
#2 Louis Dufay 3
#3 Dufay Compagnie D Exploitation 1

Latest patents

Publication Filing date Title
ES130062A1 Procedure, with its corresponding apparatus, of decoration of objects.
ES109062A1 Primary reticles of synthesis for the printing and reproduction of color proofs.
DE490388C Process for the production of plates or films for color photographic transparent and reflective images
GB191227708A Improved Manufacture of Screens for Colour Photography.
US1155900A Selecting-screen for color photography.
GB191215027A Improved Manufacture of Screens for Colour Photography.
GB190818744A Improvements in or relating to the Manufacture of Screens for use in Colour Photography.
GB190811698A Improvements in or relating to the Manufacture of Screens or Coloured Surfaces for Colour Photography.
CA270054A Coloured photography
CA301090A Colour photography
CA256054A Photography and kinematography of colours
CA245049A Photographic printing in colours