US patent 7780416 blinking sail windmill fast wind
1:13
Added: 1 year ago
From: brysam2
Views: 14,295
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  • US.PAT.OF sell patents. European's think that this is only "design protection" level patent

    RutinaRottis 4 days ago

  • How the hell did someone get a new patent on something invented in 1807?!

    MrMonkeyspanner 4 months ago

  • johnhearfield Wind/Windmills "The sails of the two five-bladed mills pictured above are evidently not of simple lattice construction. Instead, they look more like a stack of open letterboxes. This mill seems to be fitted with the so-called ‘patent sails’, which were invented in 1807. They consist of a series of hinged shutters linked together, as shown in the drawing"

    bedsdavec 1 year ago

  • I love it!

    Phacias 1 year ago

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