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Details for Patent: 5,989,581

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Patent 5,989,581 protects NUVARING and is included in one NDA. There has been one Paragraph IV challenge on Nuvaring.

This patent has thirty-one patent family members in twenty-four countries.

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;
Patent Metrics:
Source: PatentQuant.com
Field: Medical technology
Back Citations: 2nd percentile
Forward Citations: 3rd percentile

Applicant Tradename Generic Name Dosage NDA Approval Date Type RLD Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use
Organon Usa Inc
ethinyl estradiol; etonogestrel
RING;VAGINAL021187-001Oct 3, 2001RXYes5,989,581Apr 8, 2018
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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 Patent Family for Patent: 5,989,581

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
JapanH10287549<disabled in preview>
Spain2171283<disabled in preview>
Hong Kong1016886<disabled in preview>
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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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