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Last Updated: November 29, 2022

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

International Family Members for US Patent 5,989,581

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Argentina 011709 See Plans and Pricing
Austria 211646 See Plans and Pricing
Australia 6075198 See Plans and Pricing
Australia 726934 See Plans and Pricing
Brazil 9801027 See Plans and Pricing
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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