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Serving leading biopharmaceutical companies globally:

Chinese Patent Office
Queensland Health
US Army
Argus Health
Boehringer Ingelheim

Generated: November 17, 2017

DrugPatentWatch Database Preview

Details for Patent: 4,757,128

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Summary for Patent: 4,757,128

Title: High molecular weight polyanhydride and preparation thereof
Abstract:High molecular weight polyanhydrides, defined as polyanhydrides having a molecular weight average greater than 20,000 or an intrinsic viscosity of greater than 0.3 dl/g in an organic solvent at room temperature, are formed by melt polycondensation of highly pure isolated prepolymers under optimized reaction conditions, particularly time and temperature with removal of the condensation product. Higher molecular weights are obtained by inclusion of a catalyst with the prepolymers in the melt polymerization. Catalysts used for transterification, ring opening polymerization and related polymerizations may be utilized. The high molecular weight polyanhydrides have improved physico-mechanical properties and are especially well suited for biomedical applications, particularly in controlled release devices for drug delivery.
Inventor(s): Domb; Abraham J. (Brookline, MA), Langer; Robert S. (Somerville, MA)
Assignee: Massachusetts Institute of Technology (Cambridge, MA)
Application Number:06/892,809
Patent Claim Types:
see list of patent claims
Compound; Composition; Use;

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International Patent Family for Patent: 4,757,128

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada2056384► Subscribe
Germany260415► Subscribe
Germany3751964► Subscribe
Germany69028303► Subscribe
Denmark0476045► Subscribe
European Patent Office0260415► SubscribeC990036Netherlands► Subscribe
European Patent Office0260415► SubscribeSPC/GB01/013United Kingdom► Subscribe
European Patent Office0476045► Subscribe
Spain2006417► Subscribe
Spain2093647► 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:

Chinese Patent Office
Argus Health
Fish and Richardson

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