Double wall storage tank
CA 2330357 A1 · Owner: Northern Steel Industries Ltd. · Inventors: Roy, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Page 1-, A method of making a double wall tank for storing liquids comprises providing an inner tank having substantially cylindrical sidewalls and end walls; wrapping an impervious sheet material around the cylindrical sidewalls; providing a spacer means on exterior surfaces of the end walls; covering the wrapped inner tank and spacer means with reinforced resinous material to form an outer tank; and providing access to inspect an interstitial space between the impervious sheet material and the inner tank.
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 January 5, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 5, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 2023.
- 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.