GB Patent

GB0504463D0 — Method of crystallisation and purification

Assigned to Sosei R&D Ltd · Expires 2005-04-13 · 21y expired

What this patent protects

A method for the production of crystalline glycopyrronium bromide, comprises the reaction of glycopyrronium base with methyl bromide in a solvent, in which the solvent is selected such that the diastereoisomeric ratio of the product favors the R,S and S,R diastereoisomers over th…

USPTO Abstract

A method for the production of crystalline glycopyrronium bromide, comprises the reaction of glycopyrronium base with methyl bromide in a solvent, in which the solvent is selected such that the diastereoisomeric ratio of the product favors the R,S and S,R diastereoisomers over the R,R, and S,S diastereoisomers, and separating the desired diastereoisomers by one or more controlled crystallization steps. This method gives a product having a particle size of narrow distribution.

Drugs covered by this patent

Patent Metadata

Patent number
GB0504463D0
Jurisdiction
GB
Classification
—
Expires
2005-04-13
Drug substance claim
No
Drug product claim
No
Assignee
Sosei R&D Ltd
Source
FDA Orange Book + USPTO grounding via Google Patents

Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.

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