Lifting device for down hole tubulars
CA 2113161 C · Owner: W-N Apache Corporation · Inventors: Oatman, Gary T.; Willis, Clyde A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lifting device (10, 100, 200) for down hole tubulars (T) used with an earth drilling, machine (DM) having a boom (B) for moving a tubular (T) from a, horizontal position at an intermediate level to a raised position, aligned with a drilling axis (C) and a tubular holding device (H), for holding a tubular (T) horizontally at a lower level, beneath the, intermediate level. The lifting device includes first and second, spaced parallel tracks (16, 112, 216) extending from the lower level to the upper level and first, and second dolleys (18 118, 218), each guided for movement along a respective track and configured, to retain the tubular (T). The dolleys are moved along the tracks, by an …
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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
- Filed July 13, 1992 and granted October 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 2014.
- 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.