Process for the preparation of melamine
CA 1085393 A · Owner: Stamicarbon B.V. · Inventors: Van Hardeveld, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for the preparation of melamine from a feed of urea, thermal decomposition products of urea, or a mixture thereof in the presence, of a catalyst and an ammonia-containing gas. The reactor is divided into a lower and an upper reaction zone by a permeable grid or other restriction which reduces the catalyst flow between the two zones to 5 to 75% of what it would have been in the absence of such restriction. The feed is introduced into the lower reaction zone which, is maintained at a temperature of between 325 and 425°C. wherein substantially all of the urea is decomposed into thermal decomposition products, and a major portion of the thermal decomposition products are …
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 September 9, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 9, 1997.
- 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.