Method of repairing cylindrical workpieces and lathe therefor
CA 2365586 C · Owner: Argus Machine Co. Ltd. · Inventors: Hallett, Thomas A. M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of repairing a drill pipe having first and second connector ends each of the first and second connectors ends including a threaded portion and sealing portions with a lathe having a chuck with longitudinally spaced first and second sets of jaws the method comprising the steps of mounting the drill pipe in a lathe gripping the first connector end of the drill pipe with each of the first and second sets of jaws orienting the first connector end by manipulation of the first and second sets of jaws into a working position; and rotating the drilling pipe against a working tool to machine the threaded portion and sealing portion of the first connector end and produce a new threaded …
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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 28, 1998 and granted July 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 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.