Method of chimney construction
CA 1069719 A · Owner: Jackson, Kenneth R. · Inventors: Jackson, Kenneth R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a method of constructing a chimney, which includes the steps of providing an inner precast lining composed of interfitting segments stacked vertically, providing a precast concrete outer wall composed of interfitting segments in stacked relationship surrounding the lining but spaced outwardly therefrom to define an interstitial gap, providing longitudinal reinforcing steel bars within the interstitial gap, and pouring in situ concrete into the interstitial gap and allowing the concrete to harden.
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 January 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 1997.
- 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.