Preparation of quaternized glycine nitriles
CA 2198637 C · Owner: Muller, Reinhard · Inventors: Muller, Reinhard; Seelmann-Eggebert, Hans-Peter; Annen, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The production of quaternary glycine nitriles (I) in which R1 and R2 may be the same or different and are an aliphatic cycloaliphatic or araliphatic , radical with 1 to 30 C atoms whereby R1 and R2 may also form a saturated or unsaturated five or six-member heterocyclic ring together with the N atom to which they are bonded, which can also contain further hetero-atoms be , benzanellated and have alkyl side groups while R2 may also be hydrogen; R3 is , C1 to C4 alkyl or benzyl; R4 is hydrogen C1 to C20 alkyl which may be , interrupted by one or more non adjacent oxygen atoms or a radical (a) in , which R5 is a chemical bond or a C1 to C6 alkylene bridge and XO is a counterion; by the …
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 17, 1995 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 17, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2017.
- 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.