Suction nozzle with ducting
CA 2136930 C · Owner: Weber, Vincent L. · Inventors: Weber, Vincent L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum cleaner suction nozzle having a rotating agitator is provided with at least a rearward suction duct extending transversely along the nozzle and having a bottom side serving as the rear lip of the nozzle. A forward suction duct may also be included in a similar configuration and have a bottom side formed by a front lip of the nozzle. The rear and/or forward suction ducts may also include a constant velocity attribute by increasing in size from their entrant ends to their discharge ends.
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 November 29, 1994 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2016.
- 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.