Low headroom stacker crane
CA 2120900 C · Owner: Harnischfeger Corporation · Inventors: Luebke, Roger D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stacker crane comprising a trolley moveable above the ground, the trolley including a frame, a turntable supported by the frame for rotation relative to the frame about a generally vertical rotation axis, and a rotate drive which rotates the turntable relative to the frame, a mast assembly depending from and fixedly mounted to the turntable so that the mast assembly rotates with the turntable relative to the trolley frame a, carriage supported by the mast assembly for vertical movement relative thereto and for common rotation therewith relative to the trolley frame; a load engaging mechanism mounted on the carriage, and a hoist assembly including a hoist drum which has an axis of rotation …
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 April 8, 1994 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2016.
- 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.