Alumina-zirconia ceramic
CA 1268490 C · 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 consisting essentially of from 1 to 15 percent of glass and 99 to 85 percent of a mixture of particulate A12O3 and particulate ZrO2 is disclosed. ZrO2 is present in a sufficient amount, usually from 1/4 to 6 percent based on the weight of the ZrO2 and A12O3 to, strengthen the ceramic significantly by comparison with art, otherwise identical ceramic where the particulate ZrO2 is replaced either by the glass or by particulate A12O3. The glass constitutes a vitreous phase bonding the particulates into a dense, gas intpervious structure and can, be a calcium magnesium silicate glass containing from 45 to percent of SiO2, from 8 to 55 percent of CaO and MgO and not more than 15 percent …
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
- Granted May 1, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 1, 2007.
- 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.