Last Updated: November 13, 2026

Details for Patent: 4,871,543

Name: Drug Patent Intelligence for US Patent 4871543
Creator: DrugPatentWatch
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Summary for Patent: 4,871,543

Title:	Intravaginal devices
Abstract:	The invention concerns an intravaginal device comprising a combination of 17 β-estradiol and a supporting matrix for treating hypoestrogenic women. The device releases continuously 17 β-estradiol at a rate of about 0.5 to about 25 μg/24 h.The invention also comprises a method of preparing the device and a method of treating hypoestrogenic women by using the device.
Inventor(s):	Inga M. Lindskog, Bengt C. H. Sjogren, Sven-Borje Andersson
Assignee:	Pfizer Health AB
Application Number:	US07/060,833
Patent Claim Types: see list of patent claims	Use; Device;

Drugs Protected by US Patent 4,871,543

Glossary

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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: 4,871,543

Foriegn Application Priority Data
Foreign Country	Foreign Patent Number	Foreign Patent Date
Sweden	8602666	Jun 16, 1986

International Family Members for US Patent 4,871,543

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Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
Austria	68097	⤷ Start Trial
Australia	599988	⤷ Start Trial
Australia	7422287	⤷ Start Trial
Canada	1314482	⤷ Start Trial
China	1034391	⤷ Start Trial
China	87104229	⤷ Start Trial
Germany	3773557	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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