Spark plug, alumina insulator for spark plug, and method of manufacturing the same
CA 2287241 A1 · Owner: Sugimoto, Makoto · Inventors: Sugimoto, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An insulating material mainly containing alumina and having a Na content of a range from 0.07 to 0.5 weight % in terms of Na2O. Such a Na content is fairly high and has conventionally been thought absurd. The insulation resistance at high temperatures and the mechanical strength are unexpectedly not low. The material has a good performance compared to those of conventional insulating materials having Na contents lower than that of the material of the invention. As a result, in place of conventional low-soda alumina intermediate-soda , alumina or plain-soda alumina which are much more inexpensive. The manufacturing cost of an insulator (2) for spark plugs and further the …
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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 26, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.