Process for the preparation of aniline derivatives
CA 1107284 A · Owner: Ethyl Corporation · Inventors: Walter, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, 2-Benzimidazole carbamate compounds known as useful for combating parasitic infestures are made by an improved sequential process including a) thiocyanating o-nitroaniline, b) alkylating the thiocyanate this prepared, c) reducing the nitro group in the product from b), and d) condensing an alkylthio-o-phenylenediamine with an alkyl cyano carbamate (or alkali or alkaline earth metal salt thereof), to provide the desired products.
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 August 18, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 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.
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.