Process and device for evaluating the quality of a fuel-air mixture
CA 2200661 A1 · Owner: Stiebel Eltron Gmbh & Co. Kg · Inventors: Nolte, Hubert; Herrs, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The quality of a fuel-air mixture shall be evaluated by a process and a device during a phase of combustion, especially in a spark ignition engine in order to make, possible a low-emission fuel-saving and knock-free operation. An electrical testing pulse (P) is sent for this purpose to the spark plug during the phase of combustion (V) following the ignition pulse (Z). The effect of the actual fuel-air mixture of the combustion chamber on the testing pulse is detected and evaluated as an electrical variable.
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 March 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2019.
- 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.