Plunger for a plunger-lift pumping system
CA 2419612 A1 · Owner: Vermeeren, Thomas Hubert · Inventors: Vermeeren, Thomas Hubert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plunger for a plunger-lift pumping system which includes an elongate cylindrical body having a first end and a second end. A plunger suspension coupling is positioned at the first end of the body. A plurality of annular members are provided having central openings and a first radial dimension. The cylindrical body extends through the central openings of the annular members, such that the annular members overlie the cylindrical body. Spacers are provided for maintaining spacing between the annular members. The spacers have a second radial dimension which is less than the first radial dimension, thereby forming circumferential spaces along the cylindrical body between the annular members. A …
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 February 24, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2025.
- 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.