Automatic swimming pool cover with a dual hydraulic drive system
CA 2115113 C · Owner: Last, Harry J. · Inventors: Last, Harry J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic drive system is described for automatic swimming pool cover systems in which a first hydraulic drive provides torque for both resisting cover drum rotation during cover extension across the pool and rotating the cover drum for cover retraction while a, separate second hydraulic drive provides torque for; both rotating the cable reels for cover extension and resisting cable reel rotation during cover retraction.
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 7, 1994 and granted April 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2016.
- 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.