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

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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
	97201098	Apr 11, 1997

International Family Members for US Patent 5,989,581

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Austria	211646	⤷ Sign Up
Australia	6075198	⤷ Sign Up
Australia	726934	⤷ Sign Up
Brazil	9801027	⤷ Sign Up
Canada	2233753	⤷ Sign Up
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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