Pump impeller
CA 2254187 C · Owner: Arbeus, Ulf · Inventors: Arbeus, Ulf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a pump impeller of a centrifugal- or a half axial type meant to pump liquids mainly sewage water. According to the invention the pump impeller comprises a hub (1) provided with one or several vanes (2) the leading edges (3) of which being strongly swept backwards. The size of the sweep angle (.alpha.) varies between 35 and 65 degrees at the connection with the hub (1) and 55 and 85 degrees at the periphery (5)
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 17, 1998 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2020.
- 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.