Novel crystal forms of 9-substituted hypoxanthine derivatives
CA 2417337 A1 · Owner: Bollinger, Heinrich · Inventors: Bollinger, Heinrich; Glasky, Alvin; Muller, Hans Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The bifunctional compound N-4-carboxyphenyl-3-(6-oxohydropurin-9-yl) propanamide monopotassium salt occurs in a number of crystal forms which differ in their stability. Of these forms the most stable is designated Type , I which is a monopotassium salt monophydrate in which the water is held as water of crystallization. Other crystalline forms designated Type II and Type , III, convert to Type I. Methods are disclosed for the synthesis of Type I and for the conversion of Type II or Type III to Type I.
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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 February 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2023.
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Timeline
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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.