Regioselective substitutions in cyclodextrins
CA 2086100 C · Owner: The United States Of America, Represented By The Secretary, U.S. Department Of Commerce · Inventors: Rao, C. Trinadha; Lindberg, Bengt; Pitha, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of increasing the solubility of cyclodextrins comprises reacting cyclodextrins with amines under heterogeneous catalysis by exposing the cyclodextrins to ammonia and Raney nickel or subjecting the cyclodextrins to sulfatation.
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 28, 1991 and granted September 8, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2013.
- 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.