Buildings
CA 2009348 C · Owner: Ridett, Alan Hilton · Inventors: Ridett, Alan Hilton
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
With reference to Figure 3, the sloping roof 250 of a building 10 incorporates inner and outer juxtaposed metal panels 15, 16 spaced, from each other to define passageways 20 which serve as heat exchangers. A closed-loop water circulation system 18 connects the passageway 20 with low, medium and high grade heat store chambers 21, 23, 25 disposed within the building foundation structure 13. The water circulation system 18 employs sub-systems 22 29 and 31, which comprise, respectively primary, secondary and tertiary, sub-systems. The heat store chamber 21 comprises a portion of the primary circulation sub-system 22 whereby water is re-circulated through the panel passageways 20 so as to be …
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 February 5, 1990 and granted September 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.