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Serving leading biopharmaceutical companies globally:

Fish and Richardson
Johnson and Johnson
Express Scripts
Harvard Business School

Generated: November 22, 2017

DrugPatentWatch Database Preview

Details for Patent: 4,789,724

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Summary for Patent: 4,789,724

Title: Preparation of anhydride copolymers
Abstract:A method for preparation of very pure anhydride copolymers with high yield. The anhydride copolymers, consisting of aromatic and aliphatic diacids are formed by melt condensation of individually prepared, pure, isolated prepolymers. The method of preparation is characterized by high yield, reproducibility, polymer purity and controlled composition, and is a short and convenient procedure. The polyanhydrides produced by the disclosed method are particularly well suited to biomedical applications requiring low levels of toxic or inflammatory contaminants and physical and mechanical properties which closely conform to manufacturing specifications.
Inventor(s): Domb; Abraham J. (Brookline, MA), Langer; Robert S. (Somerville, MA)
Assignee: Massachusetts Institute of Technology (Cambridge, MA)
Application Number:06/920,724
Patent Claim Types:
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Process; Use;

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International Patent Family for Patent: 4,789,724

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada1278141► Subscribe
Germany266603► Subscribe
Germany3752381► Subscribe
European Patent Office0266603► Subscribe
European Patent Office0692510► Subscribe
Austria285432► Subscribe
JapanS63199227► Subscribe
Japan2626717► Subscribe
South Korea960006410► 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:

Cantor Fitzgerald
US Department of Justice
Daiichi Sankyo

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