Last Updated: November 8, 2026

FEMRING Drug Patent Profile

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Which patents cover Femring, and when can generic versions of Femring launch?

Femring is a drug marketed by Millicent Mfg Pr and is included in one NDA.

The generic ingredient in FEMRING is estradiol acetate. There is one drug master file entry for this compound. One supplier is listed for this compound. Additional details are available on the estradiol acetate profile page.

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Recent Clinical Trials for FEMRING

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SponsorPhase
Columbia UniversityN/A

See all FEMRING clinical trials

Pharmacology for FEMRING
Drug ClassEstrogen
Mechanism of ActionEstrogen Receptor Agonists

US Patents and Regulatory Information for FEMRING

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Millicent Mfg Pr FEMRING estradiol acetate INSERT, EXTENDED RELEASE;VAGINAL 021367-001 Mar 20, 2003 RX Yes No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Millicent Mfg Pr FEMRING estradiol acetate INSERT, EXTENDED RELEASE;VAGINAL 021367-002 Mar 20, 2003 RX Yes Yes ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

Expired US Patents for FEMRING

Applicant Tradename Generic Name Dosage NDA Approval Date Patent No. Patent Expiration
Millicent Mfg Pr FEMRING estradiol acetate INSERT, EXTENDED RELEASE;VAGINAL 021367-001 Mar 20, 2003 ⤷  Start Trial ⤷  Start Trial
Millicent Mfg Pr FEMRING estradiol acetate INSERT, EXTENDED RELEASE;VAGINAL 021367-002 Mar 20, 2003 ⤷  Start Trial ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >Patent No. >Patent Expiration

International Patents for FEMRING

See the table below for patents covering FEMRING around the world.

Country Patent Number Title Estimated Expiration
Argentina 002010 UN DISPOSITIVO DE LIBERACION DE DROGA INTRAVAGINAL ADECUADO PARA LA ADMINISTRACION A UN MAMIFERO HEMBRA, UN PROCEDIMIENTO PARA PREPARARLO Y USO DEPRECURSORES DE 17ß-ESTRADIOL EN EL DISPOSITIVO Y PARA LA FABRICACION DEL DISPOSITIVO. ⤷  Start Trial
Austria 178204 ⤷  Start Trial
Australia 4399196 ⤷  Start Trial
Australia 692659 ⤷  Start Trial
>Country >Patent Number >Title >Estimated Expiration

Supplementary Protection Certificates for FEMRING

Patent Number Supplementary Protection Certificate SPC Country SPC Expiration SPC Description
0136011 C00136011/03 Switzerland ⤷  Start Trial PRODUCT NMAE: ESTRADIOL UND MEDROXYPROGESTERONACETAT; REGISTRATION NO/DATE: IKS 55288 20000417
0136011 2000C/027 Belgium ⤷  Start Trial PRODUCT NAME: ETHINYLESTRADIOLUM / NORETHISTERONI ACETAS; NAT. REGISTRATION NO/DATE: 19 IS 106 F3 20000911; FIRST REGISTRATION: NL RVG 23909 19991124
0136011 99C0003 Belgium ⤷  Start Trial PRODUCT NAME: ESTRADIOL AND NORETHISTERONE; FIRST REGISTRATION NO/DATE: 403 IS 106 F3 19980928; FIRST REGISTRATION: SE 14007 19980306
0584952 99C0004 Belgium ⤷  Start Trial PRODUCT NAME: ESTRADIOL, HEMIHYDRATE, NORETHISTERONE, ACETATE; NAT. REGISTRATION NO/DATE: NL 23753 19981210; FIRST REGISTRATION: SE - 14 007 19980306
>Patent Number >Supplementary Protection Certificate >SPC Country >SPC Expiration >SPC Description

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Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. We do not provide individual investment advice. This service is not registered with any financial regulatory agency. The information we publish is educational only and based on our opinions plus our models. By using DrugPatentWatch you acknowledge that we do not provide personalized recommendations or advice. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.