Process for activation of cellulose
CA 2136733 A1 · Owner: Maginnis, James S. Jr. · Inventors: Maginnis, James S. Jr.; Mitchell, Melvin G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2136733 9325584 PCTABScor01, Disclosed is a process comprising: A) introducing cellulose and water into an activation zone; B) introducing acetic acid and sulfuric acid into the activation zone; and C) subjecting the cellulose, water, acetic acid and a catalyst to an agitation in the range of 0.04 to 4.0 kilowatts per pound of the combined weight of the cellulose, water, acetic acid and sulfuric acid for a period of time of less than 10 seconds.
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 1, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 1, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 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.
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.