Hydraulic pit jack
CA 2051850 A1 · Owner: Vicroc Inc. · Inventors: Demontigny, Jean-Guy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic pit jack comprising a housing which is supported on wheels for moving the housing over a pair of rails which are secured in a pit. A pair of hydraulic cylidners are supported vertically in the housing in transverse alignment to one another. A hydraulic oil reservoir is also provided in the housing and has a hydraulic pump therein. A motor is provided for driving the pump. A pair of four-way valves is connected in series with the pump, and are also connected to the cylinders for operating the axial displacement of a cylinder rod associated with a respective one of the cylinder. The cylinder rods each have a free rod end which protrudes from the housing when the cylinder rods are …
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 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2013.
- 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.