Method of manufacturing a spark plug with concentrically disposed double ring ground electrode
CA 2377871 A1 · Owner: Halo, Inc. · Inventors: Rasnic, Charles R.; Johnson, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method FOR manufacturing a spark plug, for an internal combustion engine provided with a double ringed ground electrode (10) permanently affixed to the spark plug base. One ring (24) provided with a downwardly displaced shielding and centering lip (22) is welded to the spark plug base while the other (15) held apart by one or more legs (32), is positioned above and concentric to the axis of, the spark plug center electrode by use of an alignment tool (50).
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 July 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2022.
- 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.