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Generated: October 16, 2017

DrugPatentWatch Database Preview

Details for Patent: 4,389,393

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Summary for Patent: 4,389,393

Title: Sustained release therapeutic compositions based on high molecular weight hydroxypropylmethylcellulose
Abstract:A carrier base material combined with a therapeutically active medicament and shaped and compressed to a solid unit dosage form having a regular and prolonged release pattern upon administration, the carrier base material being one or more hydroxypropylmethylcelluloses or a mixture of one or more hydroxypropylmethylcelluloses and up to 30% by weight of the mixture of methylcellulose, sodium carboxymethylcellulose and/or other cellulose ether, and wherein at least one of the hydroxypropylmethylcelluloses has a methoxy content of 16-24 weight-%, a hydroxypropoxyl content of 4-32 weight-% and a number average molecular weight of at least 50,000 and wherein the carrier base material constitutes less than about one third of the weight of the solid unit dosage form.
Inventor(s): Schor; Joseph M. (Locust Valley, NY), Nigalaye; Ashok (Jackson Heights, NY), Gaylord; Norman G. (New Providence, NJ)
Assignee: Forest Laboratories, Inc. (New York, NY)
Application Number:06/362,104
Patent Claim Types:
see list of patent claims
Composition; Compound; Dosage form; Use;

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International Patent Family for Patent: 4,389,393

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Spain520994► Subscribe
Denmark161014► Subscribe
Denmark137983► Subscribe
Germany3309516► Subscribe
Switzerland655241► Subscribe
Canada1188614► Subscribe
Brazil8300260► Subscribe
Belgium896136► Subscribe
Australia583616► Subscribe
France2523845► 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:

Harvard Business School
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