Door, window or building facing panel element, made namely of two flat panes enclosing a variable volume compensated gas

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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 June 7, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 2005.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.