Aqueous polymeric viscosification composition
CA 2097902 A1 · Owner: Mehreteab, Ammanuel · Inventors: Farooq, Amjad; Dixit, Nagaraj S.; Mehreteab, Ammanuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymeric viscosification agent which comprises a mixture of an amphoteric material and a water soluble low, molecular weight, non crosslinked anionic polymer in a weight ratio of the non crosslinked anionic polymer to the amphoteric material of about 15:1 to about 1:1.
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 7, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 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.