Concrete post-tensioned multiple dome and integral beam roof modules, utilizing cable-tendons, to assemble them as a roof to be supported on multiple columns, and thereafter to beused for example as a water reservoir upon the addition of a floor, surrounding walls and interio shear walls

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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 17, 1978. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 1995.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.