Ortho nitroanilines and a process for their production
CA 1250594 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Howell, Frederick H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of Disclosure, New compounds having the formula I are described: (I), wherein, R and R1, independently are H halogen, a straight- or branched-, chain alkyl having 1 to 8 carbon atoms or a residue having the formula II:, (II), wherein R2 and R3 are the same or different and each is H or straight- or branched-chain alkyl having 1 to 4 carbon atoms and R4 is H, halogen or straight- or branched-chain alkyl having 1 to 4 carbon atoms; provided that at least one of R and R1 is a residue of formula II, and that when R is a residue of formula II wherein R2 R3 and R4 are H, R1 may not be ethyl or n-propyl. Processes for producing the new compounds are also disclosed. Compounds of formula I are …
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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 February 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2006.
- 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.