Process for cleaning a facility for separating silicon components in a bath for hydrochloric pickling of steel products; the device for said process

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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

• Filed March 24, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 24, 2013.
• A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 2015.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.