(under the class definition) Power plants or accessories thereto peculiar to aircraft and incorporated with aircraft structure.
(1) Note. Power plants, per se, are found in Class 60, Power Plants.
(2) Note. Starters for power plants of aircraft type are found in Class 123, Internal-Combustion Engines, subclass 179.
(3) Note. Devices for cooling internal combustion engines by means of air are classified in Class 123, Internal-Combustion Engines, mainly in subclasses 41.56+, particularly subclass 41.7. This includes aircraft engine cowling or enclosure devices to provide for directing a flow of air against the engine or accessory parts to be cooled, and include so much of the aircraft structure as necessary to support the engine, cowling, or enclosure, or to complete the control of the flow of air through the cowling or enclosure. Broad recitation in the claims of the relation of the profile or outline of the cowling or enclosure to that of the adjacent aircraft structure is not sufficient to exclude the patent from Class 123, nor will the patent be excluded by specific recitation of airfoil or airflow characteristics of the cowling or enclosure.
(4) Note. Impellers combined with a motor are found in Class 416, Fluid Reaction Surfaces (i.e., Impellers).
