Wireline shifting tool apparatus and method
CA 1084836 A · Owner: Gearhart-Owen Industries, Inc. · Inventors: King, David W.; Pipes, Robert K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved wireline borehole shifting comprises upwardly extending upper dog means and downwardly extending lower means with, the upper dog means being extendable and retractable responsive to slack or tension, respectively, in the wireline; with the lower dog means being extendable and retractable and longitudinally movable relative to the upper dog means responsive to movement of a reciprocator shaft and power means that is disposed within the tool body beneath the lower dog means and with the lower dog means being at all times movable radially inwardly against a spring bias force. Also disclosed is an arrangement utilizing the shifting tool for running a caliper log of the borehole …
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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 September 2, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 2, 1997.
- 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.