Sealed bearing assembly used in earth drilling
CA 2102984 C · Owner: Wenzel, Kenneth Hugo · Inventors: Wenzel, Kenneth Hugo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sealed bearing assembly used in earth drilling is described having a first tubular member and a second tubular member telescopically received in the first tubular member. The second fluids member has an interior passage through which drilling fluids pass under pressure from surface pumps. A clearance space is provided between the first tubular member and the second tubular member defining a lubricant filled sealed chamber. The sealed chamber has a bit end sealed by bit end seal which faces a drill bit and a pump end sealed by pump end seal which faces surface pumps. A fixed mechanical seal is disposed in the sealed chamber intermediate the pump end seal and the drill bit end seal. The …
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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 November 12, 1993 and granted January 20, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2015.
- 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.