Walking substructure device
CA 2243465 A1 · Owner: Parker Drilling Company · Inventors: Reed, Lowell M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A walking substructure device having a drilling rig substructure. A plurality of lifting jacks is provided, each lifting jack having an upper end and a lower end the, upper end connected to the drilling rig substructure. A plurality of roller assemblies is provided, each roller assembly connected to the lower end of one of the jacks each, roller assembly pivotal radially about an axis of the lifting jack. A plurality of jack pads is provided, with each jack pad having a center beam wherein one of the roller assemblies engages the center beam and rolls thereon. A push-pull mechanism extends between each jack pad and each roller assembly in order to move the shoe assemblies in relation to the …
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 16, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 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.