Dump block
CA 2243868 C · Owner: Briscoe, Terry L. · Inventors: Briscoe, Terry L.; Kreitzberg, John S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An integral dump block for use in a dragline bucket that comprises a sheave to movably support a dump line a central pin, rotatably supporting the sheave and a housing to couple the pin to, lift lines. Bearings are disposed within the sheave and each side of the housing for receiving the pin for free rotation. Hoist lines for supporting a dragline bucket are connected to each end of the pin. In this way, moment forces in the hoisting assembly can be substantially eliminated. Further, a number of parts can be eliminated to provide a reduction in weight and height of the hoisting linkage assembly.
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 July 22, 1998 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 22, 2020.
- 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.