US1697574  Rotor adapted to be driven by wind or flowing water

Note that he filed first papers in 1924 in Finland before the 1925 US filing.

• The rotor canonically described by  Sigurd Johannes SAVONIUS has two wings interacting
  with a net rotation about an axis traverse to the wind. The axis itself may be oriented
  at any angle in a plane that is approximately perpendicular to the wind. Hence the rotor
  arrangement is not just "wing" and thus not a flipwing. Caution is recommended to note
  that there are "two" vanes with "inner" edges; the caution relates to the "S" mentioned
  where such could tease forgetting the "two" parts with "inner" edges.
  Notice carefully that he mentions the S as the shape of "passage," not the rotor. 
  Differently flipwings are one airfoil without the "segmental space" of the Savonius.
  
  Here is a clip from his filing in 1925 (though earlier his papers in Finland in 1924)
  that gives a description of the rotor he had in focus:

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