High voltage ceramic igniter
CA 2201627 C · Owner: Willkens, Craig A. · Inventors: Bateman, Linda S.; Willkens, Craig A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of heating, compris-, ing the step of providing a line voltage of between 120 V and 230 V across, a ceramic igniter having a hot zone composition comprising: (a) between, 50 and 80 v/o of an electrically insulating ceramic having a resistivity of at least about 10 10 ohm-cm; (b) be-, tween 10 and 45 v/o of a semiconductive material having a resistivity of between about 1 and about 10 8 ohm-, cm; (c) between 5 and 25 v/o of a metallic conductor having a resistiv-, ity of less than about 10-2 ohm-cm; and (d) between 2.0 and 20 v/o of, a resistivity-enhancing compound selected from the group consisting of, metallic oxides metallic oxynitrides, rare earth oxides rare earth oxyni-, …
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 October 5, 1995 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2017.
- 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.