Insulated steel grillage for road, railway, and airport construction and the like
CA 1306379 C · Owner: Pontynen, Esko · Inventors: Pontynen, Esko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Longitudinally-positioned sheets of corrugated steel (1) are joined at rightangles to latitudinally-positioned sheets of corrugated steel (2) using rivets or screws (3) thus creating a grillage-like structure. The cavities between the corrugations are filled with heat-insulating material (4) such as polystyre or peat. In road and airport construction the grillage structure will then be covered by a layer of stabilised or non-stabilised crushed aggregate or chips (5) and a further surface layer of asphalt or concrete pavement. In railroad construction rails may be fixed directly to the top layer of corrugated steel. Filling with polystyrene will permit the grillage structure to be used …
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
- Granted August 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 2009.
- 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.