Learn more

JOHN LEONARD HOLMAN

Overview
  • Total Patents
    22
About

JOHN LEONARD HOLMAN has a total of 22 patent applications. Its first patent ever was published in 1924. It filed its patents most often in United Kingdom. Its main competitors in its focus markets machine tools, mechanical elements and civil engineering are GEORGE HENRY TURTON RAYNER, PENNSYLVANIA GASOLINE DRILL CO and MONTABERT ETS.

Patent filings in countries

World map showing JOHN LEONARD HOLMANs patent filings in countries
# Country Total Patents
#1 United Kingdom 22

Patent filings per year

Chart showing JOHN LEONARD HOLMANs patent filings per year from 1900 to 2020

Latest patents

Publication Filing date Title
GB417977A Improvements in or relating to haulage apparatus for operating soil scrapers, ploughs, reaping machines and the like
GB407003A Improvements in or relating to haulage apparatus for operating soil scrapers, ploughs, reaping machines and the like
GB379374A Improvements in or relating to rock-drills and like tools
GB328235A Improvements in or relating to rock drills and like tools
GB323226A Improvements in or relating to fluid control cocks
GB322515A Improvements in or relating to reciprocating tools
GB321459A Improvements in or relating to rock-drills and like tools
GB320339A Improvements in or relating to packed glands
GB283646A Improvements in or relating to valve mechanism for fluid-operated rock drills and like tools
GB274950A Improvements in or relating to rock-drills and the like
GB260046A Improvements in or relating to rock drills and like tools
GB251384A Improvements in or relating to fluid-operated reciprocating machine-tools
GB250677A Improvements in or relating to distributing-valves for rock drills and like mechanisms
GB250340A Improvements in or relating to rock drills and like percussive tools
GB234731A Improvements in or relating to the manufacture of cradles for rock drills and like tools
GB246200A Improvements in or relating to fluid-operated reciprocating machine-tools
GB244185A Improvements in or relating to punches, rock drills and like machines
GB240914A Improvements in or relating to chucks for rock drills and like apparatus
GB230320A Improvements in or relating to cradles for machine tools such as rock drills and the like
GB238302A Improvements in or relating to pawl-driven mechanism