Process for treating waste materials with concentrated acid and the product produced thereby
CA 2175561 A1 · Owner: Soil & Water Management, Inc. · Inventors: Wilson, Harold W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for treating wood, particularly wood wastes (such as sawdust and the like), and/or paper, particularly waste paper (such as newsprint) and/or , other types of polysaccharides (matter composed essentially of cellulose and lignin), preferably available as "wastes" with concentrated sulfuric acid (93 , to 98.5 % H2SO4) or with concentrated phosphoric acid (75 to 85 % H3PO4) or , various mixtures of these acids in their concentrated forms. The product of the process can be used for treating agricultural soils or as a landfill.
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 October 27, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2016.
- 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.