Apparatus for spreading bulk materials
CA 2185760 C · Owner: Folger, Wolfgang · Inventors: Folger, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spreading apparatus for hitching to a helicopter includes a hopper suspended from a ring, three tubular legs with upper ends releasably attached to the ring, and a strut between each pair of legs. A plurality of tension cables are provided each cable, having a top end joined to the ring at a leg attachment point and a bottom end joined to a rubber roller inserted between adjacent struts where they attach to a leg with a coupling. A rotatable distributing disk having essentially radial distributing fins is positioned concentrically underneath an opening in the bottom of the hopper. The disk is larger than the opening and spaced therefrom so that bulk material in the hopper attains its …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 17, 1996 and granted February 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.