Process for preparing hydrophobically modified guar ethers
CA 2023324 A1 · Owner: Zody, George M. · Inventors: Morgan, Michael E.; Zody, George M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of Disclosure, Hydrophilic-hydrophobic derivatives of guar are made by a two step reaction wherein in the first step hydrophilic reagents, are reacted with guar splits under aqueous alkaline conditions and without isolating the product, hydrophobic reagents dissolved in an organic solvent are reacted with the guar still in particulate form.
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 August 15, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 2012.
- 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.