Improvements in pumps
CA 2303569 A1 · Owner: Concentric Pumps Limited · Inventors: Tebby, Stephen Walker
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluid pump (10) comprising a body housing (14) a fluid pumping chamber having, a rotatable pumping member (16) a drive shaft (12) which passes through an aperture in the body into the pumping chamber to effect rotation of the pumping, member in use, and a seal (18) between the pump body and rotary shaft to inhibit, fluid moving along the shaft out of the pumping chamber characterised by a, dividing shroud (32) operably located between the seal and the rotatable pumping, member to divide the seal chamber (30) between the seal and the rotary pumping member.
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 March 30, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2022.
- 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.