Process for preparing crystalline beta-lactam monohydrate
CA 2125000 A1 · Owner: Wildfeuer, Marvin E. · Inventors: Wildfeuer, Marvin E.; Nist, Robert L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for the preparation of the crystalline monohydrate form of the compound of the formula (I), (I), which comprises the step of mixing a form of loracarbef other, than the crystalline monohydrate such as the ethanol crystal, acetone crystal crystalline dihydrate, acetonitrile crystal methanol crystal, propanol crystal, ethyl acetate crystal methylene chloride crystal, crystalline bis(DMF) and crystalline mono(DMF) form, in water at a temperature between about 30°C to about 60°C, and preferably at a temperature between 40°C and 50°C. Conversion may also be accomplished by exposing the loracarbef form to saturated steam at a temperature of between about 90° to …
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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
- Filed June 2, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2016.
- 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.