Roof tile
CA 2134929 A1 · Owner: Oldcastle, Inc. · Inventors: Fifield, John Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An extruded roof tile 30 has an upper surface 11 which is contoured to give theappearance of a profiled tile and which is for example provided by projections 30 34, extending between the upper and lower edges 13 and 14a respectively of the tile and cm, under surface 12 having a shape which is other than a contoured shape which generally follows that of the upper surface 11 of the tile 30. For example the undersurface 12, may have a shape which corresponds to that of a flat tile. In one method of making the tile 30, a material from which the tiles 30 are made is extruded onto a path which shapes the under surface 12 of tiles 30, the material is compressed to provide the upper surface 11 of …
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 November 2, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 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.