Immobilization of lead and cadmium in solid residues from the combustionof refuse using lime and phosphate
CA 1293740 C · Owner: O'Hara, Mark J. · Inventors: O'Hara, Mark J.; Surgi, Marion R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Solid residues arising from the burning of solid wastes have lead and cadmium sufficiently insolubilized to pass the EPA toxicity test only where the pH in the EPA test is between 7.5 and 12Ø Addition of water soluble phosphate, especially phosphoric acid increases the, immobilization of lead and cadmium so as to make such residues in compliance with the toxicity tests over a substantially broader pH range.
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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 December 31, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 31, 2008.
- 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
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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.