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Class Information
Number: 416/175
Name: Fluid reaction surfaces (i.e., impellers) > Diverse impellers or working members
Description: Apparatus comprising at least two impellers* or working members* which differ significantly in structure other than by size or orientation.

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
4247252 Vertical axis wind turbine Jan. 27, 1981
4217501 Mounting for windmills Aug. 12, 1980
4207028 Extendable and retractable propeller for watercraft Jun. 10, 1980
4205943 Hydro-electric generator Jun. 3, 1980
4180369 Wind mills Dec. 25, 1979
4178131 Centrifugal impellers Dec. 11, 1979
4130378 Side propellers for the propulsion of fast boats and aircraft Dec. 19, 1978
4128363 Axial flow fan Dec. 5, 1978
4120603 Jet flap controlled fuel pump Oct. 17, 1978
4097192 Turbine rotor and blade configuration Jun. 27, 1978
4061441 Centrifugal fan for circulating room air Dec. 6, 1977
3953150 Impeller apparatus Apr. 27, 1976
3936240 Centrifugal-vortex pump Feb. 3, 1976

1 2 3 4

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