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Class Information
Number: 244/65
Name: Aeronautics > Aircraft propulsion > Screw
Description: The arrangement relative to aircraft and the combination with aircraft of devices using the effect of helical screws rotating in air for propelling aircraft.

Sub-classes under this class:

Class Number Class Name Patents
244/67 Body encircling 7
244/69 Contra-propeller arrangements 20
244/68 Elongated 2
244/66 Tilting 36

Patents under this class:

Patent Number Title Of Patent Date Issued
8388391 Screw conveyor shape propeller Mar. 5, 2013
8286909 Boundary layer propulsion airship with related system and method Oct. 16, 2012
7850116 Ducted open rotor apparatus and method Dec. 14, 2010
7121505 Method of control for toy aircraft Oct. 17, 2006
6457671 Funneled rotary foil Oct. 1, 2002
6264138 Propeller gearbox Jul. 24, 2001
6138946 Device for lift and to reduce resistance to aircraft advance Oct. 31, 2000
5971322 Propeller propulsion unit for aircrafts in general Oct. 26, 1999
5961067 Method for reducing turboprop noise Oct. 5, 1999
5839926 Airboat systems and methods for increasing engine efficiency while reducing torque and noise Nov. 24, 1998
5823466 Propeller balancing method and apparatus Oct. 20, 1998
5810288 High velocity propeller Sep. 22, 1998
5810289 High velocity propeller Sep. 22, 1998
5791595 Propeller balancing method and apparatus Aug. 11, 1998
5743489 Aircraft with two alternatingly operated propellers of different radius Apr. 28, 1998
5588619 Propeller syncro-pulsing Dec. 31, 1996
5516061 Shroud for a reversible thrust fan May. 14, 1996
5292088 Propulsive thrust ring system Mar. 8, 1994
5135185 Wing mounted unducted fan engine Aug. 4, 1992
4930725 Pusher propeller installation for turboprop engines Jun. 5, 1990
4892269 Spinner ducted exhaust for pusher turboprop engines Jan. 9, 1990
4871130 Propulsion apparatus for an aircraft Oct. 3, 1989
4795308 Obstacle in front of a propeller Jan. 3, 1989
4676459 Double propeller for propelling aircraft Jun. 30, 1987
4630787 Airframe and propulsion system Dec. 23, 1986
4611774 Propeller drive assembly Sep. 16, 1986
4504029 Fluid motor driven multi propeller aircraft Mar. 12, 1985
4500055 Aircraft propulsion system arrangement Feb. 19, 1985
D246168 Man powered airplane Oct. 25, 1977
3968944 Aircraft with shrouded propeller drive Jul. 13, 1976

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