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BREWSTER PERCY DOUGLAS

Overview
  • Total Patents
    16
About

BREWSTER PERCY DOUGLAS has a total of 16 patent applications. Its first patent ever was published in 1908. It filed its patents most often in United Kingdom, Canada and United States. Its main competitors in its focus markets optics and semiconductors are PFENNINGER OTTO, DOUGLASS LEON F and LOUIS CAMILLE DANIEL ANDRE CHE.

Patent filings in countries

World map showing BREWSTER PERCY DOUGLASs patent filings in countries
# Country Total Patents
#1 United Kingdom 8
#2 Canada 4
#3 United States 3
#4 Denmark 1

Patent filings per year

Chart showing BREWSTER PERCY DOUGLASs patent filings per year from 1900 to 2020

Focus industries

# Industry
#1 Optics
#2 Semiconductors

Top inventors

# Name Total Patents
#1 Brewster Percy Douglas 16

Latest patents

Publication Filing date Title
GB130002A Improvements in Apparatus for Color Cinematography.
CA193747A Colour photography
US1224442A Transferring photographic prints from separate supports to a single support.
US1208739A Color photography.
GB100082A Improvements in Light Splitting Devices for use in Colour Photography and for other purposes.
US1233176A Apparatus for printing cinematographic films.
GB191514102A Improvements in Colour Photography.
GB191502463A Improvements in Colour Photography.
GB191501073A Improvements in Color Photography.
GB191403435A Improvements in the Act of Color Photography.
GB191502465A Improvements in the Art of Colour Photography.
GB190813869A Improvements in and relating to Rotary Blowers.
CA385802A Colour cinematography
CA358213A Colour photography
CA370015A Photographic emulsion mark removing method