Lead-free glaze for alumina bodies
CA 1097696 A · Owner: Champion Spark Plug Company · Inventors: Knapp, Randy O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high-silica ceramic glaze having a low co-, efficient of thermal expansion suitable for application, to alumina bodies is disclosed; The glaze consists, essentially by weight percent, of 48 to 54 percent SiO2, from 7 to 11 percent A1203, from 16-1/2 to 20 percent B2O3, from 11 to 14 percent BaO from 2 to 3, percent CaO, from 2 to 2-1/2 percent ZnO from 4-1/4, to 5-1/4 percent Na2O, and from 0.4 to 1 percent K2O. Li2O and MgO to the extent of up to about 1/4 percent and 1 percent, respectively, can also be tolerated as, can minor amounts of other impurities.
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 March 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 1998.
- 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.