1
Kari Appa: Contra-rotating wind turbine system. Albert W Hilburger, August 21, 2001: US06278197 (105 worldwide citation)

Wind turbine apparatus includes an upright mast with support bearings underlying and rotatably supporting a hub assembly having inner and outer coaxial shafts telescopically related but radially spaced to permit independent rotation about a generally horizontal axis. An armature winding is provided ...


2
Jay Haskin: Power transmission system for turbine or compressor having counter-rotating blades. Egbert Law Offices PLLC, August 29, 2017: US09745860

A power transmission apparatus has a housing, a first shaft rotatably mounted within the housing, a second shaft rotatably mounted within the housing and extending around at least a portion of the first shaft, a third shaft exterior of the first and second shafts and positioned within the housing, a ...


3
POWER TRANSMISSION SYSTEM FOR TURBINES OR COMPRESSORS HAVING COUNTER-ROTATING BLADES. May 3, 2018: US20180119562-A1

A power transmission for a turbine or a compressor has a housing, a first shaft rotatably mounted so as to be rotatable in one direction in the housing, a barrel rotatably mounted so as to be rotatable in a direction opposite to that of the first shaft within the housing, a first plurality of blades ...


4
POWER TRANSMISSION SYSTEM FOR TURBINE, A TURBOCHARGER, A COMPRESSOR, OR A PUMP. November 8, 2018: US20180320543-A1

A power transmission system for use with a turbine, a turbocharger, or a compressor has a housing, a first shaft mounted within the housing, a second shaft rotatably mounted within the housing and positioned exterior of the first shaft, a second set of blades affixed to the first shaft, and a second ...