Slab-like concrete block, as well as process and device for manufacturing the latter
CA 2067332 A1 · Owner: Sf-Vollverbundstein-Kooperation G.M.B.H. · Inventors: Hagenah, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
When concrete paving stones are used as a ground covering the, noise generated by traffic moving thereon constitutes a drawback. To reduce the propagation of noise the invention proposes, concrete blocks which are of a considerably larger format that the customary paving stones. The upper side of the concrete block consists of a sound-absorbing layer (13) of porous concrete. The underside of the concrete block is curved inwards so that the edge regions are more heavily loaded, thus ensuring stability. To channel the surface water away, the concrete block is provided at the sides with vertical slits (16) which are adjacent to the absorption layer (13) consisting of porous concrete.
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 5, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2012.
- 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.