Pump drive head backspin retarder
CA 2187579 C · Owner: Hult, Vern Arthur · Inventors: Hult, Vern Arthur; Schubert, Edward Leigh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pump drive head backspin retarder includes a vane pump having an impeller with a plurality of spring loaded vanes and a pawl clutch centrally disposed in the impeller and having a hub and a plurality of pawls. Each pawl is pivotally attached to the hub for movement between first and second positions. The impeller includes a plurality of pawl receiving recesses, whereby, for a first direction of rotation pawls, of the pawl clutch pivot to the first position corresponding to a disengaged state for providing no mechanical contact with the impeller and, for a second direction of rotation opposite the first pawls of the, pawl clutch pivot to the second position due to inertia corresponding to …
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 October 10, 1996 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2018.
- 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.