Aluminum oxide ceramics having improved mechanical properties
CA 2020486 A1 · Owner: Ferro Corporation · Inventors: Berneburg, Philip L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wear-resistant alumina material is disclosed as is, its preparation by liquid phase sintering a mixture of about 70 to 95 percent by weight of crystalline Al2O3 particles and about 30 to 5 percent by weight of glass phase-forming components in a nitrogenizing atmosphere from which oxygen is substantially excluded. Generally the resulting material has a 5 Kg Vickers hardness which is at least about 5 percent greater than the hardness of a corresponding alumina material sintered in air.
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 July 5, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 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.