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Last Updated: September 22, 2021

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Details for Patent: 5,989,581

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Summary for Patent: 5,989,581
Title: Drug delivery system for two or more active substances
Abstract:The present invention is dealing with a drug delivery system, preferably in a ring-shaped form suitable for vaginal administration, for the simultaneous release of a progestogenic steroid compound and an estrogenic steroid compound in a fixed physiological ratio over a prolonged period of time. The drug delivery system comprises at least one compartment comprising a thermoplastic polymer core containing the mixture of the progestogenic and estrogenic compounds and a thermoplastic polymer skin, the progestogenic compound being initially dissolved in the polymer core material in a relatively low degree of supersaturation.
Inventor(s): Groenewegen; Rudolf Johannes Joseph (Heesch, NL)
Assignee: Akzo Nobel N.V. (Arnhem, NL)
Application Number:09/056,700
Patent Claim Types:
see list of patent claims
Compound; Delivery;

Drugs Protected by US Patent 5,989,581

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

Foreign Priority and PCT Information for Patent: 5,989,581

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
97201098Apr 11, 1997

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