Filter condition indicator
CA 2545976 C · Owner: Emerson Electric Co. · Inventors: Tomasiak, Mark J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter condition indicator for a vacuum appliance having a filter includes a housing with a diaphragm dividing the housing into first and second chambers. One chamber receives a pressure indication from inside the filter and the other chamber receives a pressure indication from outside the filter. An indicator device is activated by movement of the diaphragm in response to a pressure differential between the first and second chambers.
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 8, 2006 and granted March 19, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.