Well pipe jack
CA 1185228 A · Owner: Varco International, Inc. · Inventors: Boyadjieff, George I.; Campbell, Andrew B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A jack for lowering casing from a drilling rig into a well, including a plurality of piston and cylinder mechanisms extending vertically at different sides of the well axis and supported at their lower ends from a base a first upper structure, extending between upper ends of the cylinders of those mechanisms and supported from the base through the cylinders a second upper, structure supported by and movable with the pistons and gripping, units carried by the two structures and releasably engageable with the casing to lower it in steps by relative vertical actuation of the two structures by the piston and cylinder mechanisms.
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
- Granted April 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 2002.
- 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.