Process for producing improved concrete pavement having water permeability
CA 2107225 C · Owner: Domon, Shozo · Inventors: Domon, Shozo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for producing an improved concrete pavement having water permeability comprising the steps of, -preparing a concrete composition of 300 to 400 kg of cement per 1 m3 of the concrete composition, 0.008 to 0.04 parts by weight of binder per 1 part by weight of cement, 0.3 to 0.45 parts by weight of water per 1 part by weight of cement, of water, and, 1,790 to 2,150 kg of aggregate comprising sand and at least one of crushed stone and gravel in the ration by weight between 5:95 and 20:80, said crushed stone having a grain size of 2.5 to 5 mm and said gravel having a grain size of 5 to 10 mm, per 1 m3 of the concrete composition -hardening the concrete …
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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 September 28, 1993 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2015.
- 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.