Synthetic aggregate and landfill method
CA 2111954 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
An abrasion resistant synthetic aggregate made from an intimately intermixed combination of lime, fly ash and sulfate/sulfite sludge (e.g. FDG sludge), mixed to the point where the mixture is nearly optimum density and thixotropic or compressible or non-compressible and plastic. This mixture is placed in a landfill. After a relatively brief cure period, the landfill is ripped and the material is crushed and graded. The aggregate which in some, instances may qualify as a lightweight aggregate has a Los Angeles, Abrasion Resistance of less than 60 % and may in some cases be less , than 50 % (medium particles passing) according to that test.
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.