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Four stroke.
Nickolaus Otto came up with an idea for an more efficient engine and came up with the four cycle. it uses the motion of the last compression to get enough air and fuel to fire off again. that and the exhaust it better then the three storkes -
Re-breather
Henry Fleuss received an patient to remake and remodel the re-breather and the British army divers in world war one. -
Three wheeler
Karl Benz Invented the frist gas powered motor wagon every to be driven -
Ball point pen
The maker of the ball point pen John J. Loud wanted something thta could easily write of typical things old fountian pens couldn't -
Escalator
Jesse W. Reno set a patent for the every first "endless Conveyor belt" and the name was never meant to be called an escalator just an "inclined elevator' -
Vacuum
The very first patent for an electric sweeper that later became the vacuum cleaner.