Expired Canadian patentCanada
Synthesis of 2-keto-1,4-diazacyclo-alkanes
CA 1109869 A · Owner: Goodrich (B.F.) Company (The) · Inventors: Lai, John T.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polysubstituted 2-keto-1,4-diazacycloalkanes are produced by reaction of a 1,2-diamine with a monoketone or monoaldehyde and a haloform in the presence of an onium salt catalyst.
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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 September 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 15, 1980
GrantedSeptember 29, 1981
Term endedSeptember 29, 1998
Patent numberCA 1109869 A
Classification (IPC)C07D241/00 +1 more
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.