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Serving leading biopharmaceutical companies globally:

Fish and Richardson
Queensland Health

Generated: December 16, 2017

DrugPatentWatch Database Preview

Details for Patent: 5,438,071

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Summary for Patent: 5,438,071

Title: Stable porfimer sodium compositions and methods for their manufacture
Abstract:A storage stable porfimer sodium (polyhematoporphyrin ether/ester) composition useful in the photodynamic therapy of cancer and other conditions is provided. The composition is characterized in that the percentage of ester linked porphyrin oligomers is less than 10% of the composition. Improved processes for preparing such compositions are also provided wherein acetylated hematoporphyrin is treated with alkali for sufficient time and temperature to reduce the amount of porphyrin oligomers joined by ester linkages to less than 10% of the composition.
Inventor(s): Clauss; Steven L. (Manville, NJ), Pastel; Michael J. (Highland Mills, NY), Zawadzki; Rainer K. (Wuhan, CN)
Assignee: American Cyanamid Company (Stamford, CT)
Application Number:08/075,227
Patent Claim Types:
see list of patent claims
Composition; Compound; Use;

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International Patent Family for Patent: 5,438,071

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada2094974► Subscribe
Germany69309340► Subscribe
Denmark0568323► Subscribe
European Patent Office0568323► Subscribe
Austria150968► Subscribe
Spain2104056► Subscribe
Greece3023978► Subscribe
JapanH06220062► Subscribe
Japan2928047► Subscribe
South Korea100221206► Subscribe
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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.

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Serving leading biopharmaceutical companies globally:

Farmers Insurance
Cantor Fitzgerald

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