Boom hoist cylinder crane
CA 2203711 C · Owner: Manitowoc Crane Group, Inc. · Inventors: Wernecke, Charles R.; Pleuss, Alan E.; Walker, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A crane having an upper works rotatably mounted on a lower works and a boom pivotally mounted on the upper works preferably includes a hydraulic boom hoist cylinder a, hydraulic circuit for controlling the hydraulic boom hoist cylinder a multiple position wire, rope guide, a counter weight positioning mechanism and a boom parking device. The crane, comprises a mast and a hydraulic cylinder pivotally connected to the upper works. The connection of the mast to the upper works is at a location separate from and at an elevation, below, the elevation of the connection of the hydraulic cylinder to the upper works. The hydraulic cylinder is pivotally connected to the mast and pendently connected …
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 25, 1997 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2019.
- 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.