USPC 244/68

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U.S. patent classification subclass 244/68 is for patents related to elongated propellers: Arrangement of aircraft screw propellers of the long helix type, in which the blades extend for substantially a full pitch length or more along the hub members.[1][2]

Related subclasses:[1][3]

  • USPC 244/67 for elongated propellers arranged to rotate about the external periphery of some aircraft body
  • USPC 244/73 for elongated propellers arranged in tubes for fluid propulsion

References

Patents in category USPC 244/68

Enclosing categories USPC 244/65
Subcategories
Keywords Propellers
Start year
End year