Roper's hot air engines patents

Sylvester H. Roper was another prolific inventor. He filed numerous patents related to Padlocks, Knitting-Machines, Fire-Arm, Metal-Screw Machines, Magazine-Gun, Revolving Fire-Arms, Detachable Muzzle For Shot-Guns, Fire-Escape and also... hot air engines.
He is also known for having invented a steam-powered bike.

He filed several patents for a hot air engine. And he finally succeeded in building hot air engines ranging from 1 to 4 HP.
In 1869, over 200 engines were in operation.

Roper's Air Engines patents

Year Patent Number Comment Title
1862 Roper patent #34,333 Improvement in Hot Air Engines
1862 Roper patent #34,723 Improvement in Hot Air Engines
1863 Roper patent #38,866 Improvement in Hot Air Engines