Guardrail cleaner
CA 2181974 C · Owner: Kouei Kogyo K.K. · Inventors: Oomura, Yasutoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A guardrail cleaner includes a frame equipped with upper rollers for mating with an upper guardrail edge and a lower roller for pressing against the guardrail rear surface, a drive wheel for moving the cleaner along the guardrail by traction on the surface thereof rotating, device for rotating the drive wheel a wire buffing wheel, for cleaning the guardrail surface and a device for, rotating the wire buffing wheel. The cleaner is optionally equipped with a dirt catcher and/or paint spraying nozzles.
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 July 24, 1996 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 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.