Abrasion-resistant synthetic article and method of making
CA 2111556 A1 · Owner: Conversion Systems, Inc. · Inventors: Smith, Charles L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of a water-insoluble abrasion-resistant, synthetic solid article or aggregate as well as the, products produced thereby. Fly ash lime, water and FGD sludge are, mixed intimately and formed at pressures exceeding 1,000 psi preferably 4000-8000 psi. The product is cured for at least the equivalent of 28 days at 73· F, and crushed and sized to produce a commercial aggregate, for example, for concrete asphalt, concrete, masonry units, etc.
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 June 15, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 15, 2014.
- 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.