USPC 244/28

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LTA aircraft with propulsion from flapping wings.

Category within USPC 244/24, LIGHTER-THAN-AIR AIRCRAFT:

Miscellaneous aircraft which ordinarily have a total weight less than or equal to that of the volume of air which they displace and are therefore sustained by their buoyancy with respect to the air.[1]

244/28 defined as follows:[1]

Airship and beating wing sustained: This subclass is indented under subclass 24. Propelled aeronautical machines sustained by their buoyancy relative to the air, having also provision for sustentation or vertical lift by the downward thrust developed by flapping or reciprocating blades attached to the machines. These blades may also provide a part or all of the forward propulsion.
(1) Note. For machines having fixed sustaining air foils as well as beating wings, see this class, subclass 11.
(2) Note. For machines sustained by beating wings alone, see this class, subclass 22.
(3) Note. For beating wing construction, per se, see this class, subclass 72.

CPC does not seem to have a category for airships powered by flapping, and patents classified as USPC 244/28 often fall into the more general LTA category CPC B64B1/00.

Enclosing categories USPC 244/24
Subcategories
Keywords Flapping, Ornithopter
Start year
End year


Patents in category USPC 244/28

References