Proactively manage your pharmacy inventory
Deep knowledge on
small-molecule drugs and
the 110,000 global patents
Manage your formulary budget
Drug patents …
… from Kazakhstan to Kalamazoo
Anticipate generic drug launch
Find generic entry opportunities
|Title:||Donepezil polycrystals and process for producing the same|
|Abstract:||The present invention provides novel polymorphic crystals (A) to (C) having excellent handling properties and an extremely low content of residual solvent of donepezil used as a precursor for production of donepezil hydrochloride having an excellent action as a medicament, and an industrial process for producing the same. Further, the novel polymorphic crystals (A) to (C) according to the present invention are characterized by the powder X-ray diffraction pattern and/or IR absorption peaks of donepezil represented by the following formula: ##STR1##|
|Inventor(s):||Imai; Akio (Ibaraki, JP), Ichinohe; Toshiyuki (Ibaraki, JP), Endo; Takashi (Ibaraki, JP), Tsurugi; Tomio (Ibaraki, JP), Uemura; Makoto (Ibaraki, JP)|
|Assignee:||Eisai Co., Ltd. (Tokyo, JP)|
Patent Claim Types:|
see list of patent claims
Field: Organic fine chemistry
Back Citations: 4th percentile
Forward Citations: 0th percentile
|Country||Document Number||Estimated Expiration||Supplementary Protection Certificate||SPC Country||SPC Expiration|
| This preview shows a limited data set|
Subscribe for full access, or try a Trial
The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.
Export unavailable in trial.
Subscribe for complete access.