Mass air flow meter
CA 2083047 C · Owner: Atwood, Robert K. · Inventors: Atwood, Robert K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improvements in a mass air flow meter for internal combustion engines are disclosed which comprise stntcture for improving the flow dynamics of the air flow through the sampling path including expansion of the dynamic range and increase of the signal to noise ratio resulting in improved engine performance fuel efficien-, cy, and emission control. Such structure includes a sample tube (12) being tapered in decreasing area in the direction of air flow therethrough and a pneumatic equivalent of a low pass RC filter which decouples the high turbulence in the main flow through the venturi (10) av-, erages same and provides a scaled down profiled flow through the sample tube for measurement by a …
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 May 16, 1991 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2013.
- 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.