Only combustion and expansion of charge in engine:
(under subclass 200) Apparatus wherein the piston structure, the cylinder structure, or the other elements cooperate to form an enclosed space in which only burning of the combustible mixture and the enlargement of the combusted material occurs, the compressed combustible material being supplied from an undefined source.
(1) Note. This subclass is limited to patents which do not claim the kinetic compressor or other source of the compressed air or fuel mixture. Patents claiming such a compressor or source have been classified in subclasses 221+.
