Milling apparatus with replaceable blades
CA 2016238 C · Owner: Smith International, Inc. · Inventors: Desai, Praful C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipe milling apparatus for milling away tubular casing encased within well bores has a tubular body (12) having at least two equi-circumferentially spaced longitudinal slots (14) formed through the circumferential wall of the body and a milling blade (40) radially extends through each slot, each milling blade having a longitudinally extending flange portion (42, 46, 47) inside the tubular body the flange, portion including a tab (46) for holding the blade within the tubular body. A radially inner surface (48) of each blade has a tapered surface for cooperating with a cylinderical mandrel (20) that is inserted into the tubular body, the mandrel having a taper corresponding to the taper on …
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 May 8, 1990 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2012.
- 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.