Ionically modified cellulose materials
CA 1092083 A · Owner: Ciba-Geigy Ag · Inventors: Haase, Jaroslav; Bowes, Quentin; Wurster, Rudolf F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cellulosic adsorption material for the removal of heavy metal ions free fluids, which material contains at least one chelate-forming amino acid group which is bonded through the group of the formula - O - CH2 - ? - CO -, to the cellulose portion whilst the carbonyl group is, linked to the chelate-forming radical and the oxygen is linked to the cellulose portion.
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
- Granted December 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 23, 1997.
- 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.