Crystallization of ibuprofen
CA 1212693 A · Owner: Upjohn Company (The) · Inventors: Amin, Sanjay I.; Gordon, Roger E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ibuprofen is crystallized from a .delta.H > 8 liquid such as a C1 to C3-alkanol, e.g. methanol, containing solutions thereof to obtain ibuprofen crystals which are equant (cube sphere or grain) in shape, which ibuprofen crystals have larger average particle size higher, bulk density, lower bulk volume and improved flow properties compared to previously known bulk ibuprofen crystalline materials.
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 October 14, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 14, 2003.
- 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.