Progressing cavity pump with constant liner thickness
CA 2356718 A1 · Owner: Blundell, C. Christopher · Inventors: Blundell, C. Christopher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The progressing cavity pump or motor stator has a generally constant liner thickness, by contrast with prior art pumps having very large liner thickness variations. The pump, or motor stator is made by first coating a helicoidal mandrel with at least one liner, material to define a liner of generally constant thickness; then placing the liner-coated, mandrel in a housing; then placing a liquid (or liquid containing solids) intermediate, material between the liner and the housing the intermediate material being of , a type which can then be solidified; then so solidifying the intermediate material to bond it to, the liner and the housing; and then retracting the mandrel leaving the …
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 August 30, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 30, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2023.
- 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.