Ice pebbling
CA 2201684 C · Owner: Thompson, Albert N. · Inventors: Thompson, Albert N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3- An ice pebbler is used for pebbling a sheet of curling ice. The pebbler has a wheel supported base that may be pulled or motor driven across a sheet of ice. The pebbler carries a water container for the pebbling water and a pebbler head mounted on the base for lateral movement across the sheet. The pebbler may be manually operated pulled by hand and with a hand crank for swinging the pebbler head across the sheet. In the preferred arrangement the wheels and the pebbler head movement are driven so that the pebbler will travel at a uniform speed along the ice sheet. The swinging movement of the pebbler head may be driven by the wheels or motor driven to provide even greater pebbling …
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 April 3, 1997 and granted June 17, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2019.
- 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.