Vacuum cleaner
CA 2095298 C · Owner: Puri, Krishan Kumar · Inventors: Puri, Krishan Kumar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum cleaner having a body with an inlet opening for dust laden air and an outlet. An impeller is located between the inlet and the outlet. A chamber within the body having at least one wall receives a perforate dust receptacle. The chamber is located up-stream of the impeller. An inlet passageway extends from the inlet opening into the chamber. This passageway is directed so that when a perforate dust receptacle is in position in the chamber, the inlet passage has an outlet directed at a wall of the dust receptacle. Dust laden air entering the receptacle is filtered to remove dust. The dust laden air, forced against the wall by the impeller acts, to keep the wall free of dust …
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 April 30, 1993 and granted May 6, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2015.
- 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.