Method for preventing low-temperature degradation of tetragonal zirconia containing materials
CA 2320830 A1 · Owner: Van Weeren, Remco · Inventors: Goldacker, Jeffrey A.; Whalen, Philip J.; Van Weeren, Remco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ceramic body having a surface region containing tetragonal zirconia is sintered to at least 95 % theoretical density at a temperature below about 1550 ~C. The surface region is then heat treated to reverse local stresses therein. Low temperature degradation in tetragonal zirconia and materials , containing tetragonal zirconia is significantly inhibited. The heat treated ceramic is especially suited for use in structural components such as valves engine housings, pistons (chambers) and the like which during operation, are , frequently exposed to temperatures ranging from room temperature to 500 ~C for prolonged periods of time.
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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 February 18, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2021.
- 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.