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JOHN ALFRED HENRY HART

Overview
  • Total Patents
    11
About

JOHN ALFRED HENRY HART has a total of 11 patent applications. Its first patent ever was published in 1942. It filed its patents most often in United Kingdom. Its main competitors in its focus markets optics and basic materials chemistry are FORTE FOTOKEMIAI IPAR, SCHWARTZ YORK and ALBERT AUGUST.

Patent filings in countries

World map showing JOHN ALFRED HENRY HARTs patent filings in countries
# Country Total Patents
#1 United Kingdom 11

Patent filings per year

Chart showing JOHN ALFRED HENRY HARTs patent filings per year from 1900 to 2020

Focus industries

Latest patents

Publication Filing date Title
GB633936A Improvements in or relating to photographic materials
GB585760A Improvements in or relating to photographic emulsions
GB585758A Improvements in or relating to the production of photographic emulsions
GB585759A Improvements in or relating to the production of photographic materials
GB580511A Improvements in or relating to photographic materials
GB580506A Improvements in or relating to photographic materials
GB577230A Improvements in or relating to photographic materials and processes
GB575512A Improvements in or relating to photographic materials
GB573917A Improvements in or relating to photographic materials
GB566832A Improvements in or relating to photographic materials
GB558262A Improvements in or relating to the purification of gelatin