Alumina ceramic comprising a siliceous binder and at least one of zirconia and hafnia
CA 1232620 A · Owner: Champion Spark Plug Company · Inventors: Manning, William R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ceramic composed of 1 to 15 percent of glass and 99 to 85 percent of a mixture of particulates is disclosed. The glass present as a vitreous phase bonding the particulates into a dense, gas impervious structure contains 45 to 80 percent of SiO2, 8 to 65 percent of CaO and MgO and not more than 15 percent of Al203. The particulates, which are finer than 15 microns in ultimate particle size, include Al203 and at least one of ZrO2 HfO2, and solid solutions of the two. The ceramics are subject to microcracking, which can be cured by refiring or prevented, by including particulate Y203 as a stabilizer.
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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
- Granted February 9, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 9, 2005.
- 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.