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Details for Patent: 5,798,338

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Patent 5,798,338 protects BEYAZ, SAFYRAL, and YAZ, and is included in three NDAs. There have been zero Paragraph IV challenges on Safyral, Yaz, and Beyaz.

This patent has eleven patent family members in nine countries.

Summary for Patent: 5,798,338

Title: Solid dosage forms that contain clathrates of 17.alpha.-ethinyl estradiol
Abstract:A method and pharmaceutical compositions are disclosed for reducing oxidative degradation of 17 .alpha.-ethinylestradiol comprising combining the estradiol with an effective amount of cyclodextrin, thus forming a cyclodextrin clathrate of the steroid.
Inventor(s): Backensfeld; Thomas (Berlin, DE), Tack; Johannes (Berlin, DE)
Assignee: Schering Aktiengesellschaft (Berlin, DE)
Application Number:08/765,823
Patent Claim Types:
see list of patent claims
Composition; Use; Dosage form; Formulation;
Patent Metrics:
Source: PatentQuant.com
Field: Not categorized
Back Citations: 1st percentile
Forward Citations: 0th percentile

Applicant Tradename Generic Name Dosage NDA Approval Date Type RLD Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use
Bayer Hlthcare
BEYAZ
drospirenone; ethinyl estradiol; levomefolate calcium
TABLET;ORAL022532-001Sep 24, 2010RXNo5,798,338► subscribeY
Bayer Hlthcare
SAFYRAL
drospirenone; ethinyl estradiol; levomefolate calcium
TABLET;ORAL022574-001Dec 16, 2010RXYes5,798,338► subscribeY
Bayer Hlthcare
YAZ
drospirenone; ethinyl estradiol
TABLET;ORAL021676-001Mar 16, 2006RXYes5,798,338► subscribeY
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Foreign Priority and PCT Information for Patent: 5,798,338

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Germany44 26 709.6Jul 20, 1994
PCT Information
PCT FiledJuly 10, 1995PCT Application Number:PCT/EP95/02656
PCT Publication Date:February 01, 1996PCT Publication Number: WO96/02277

International Patent Family for Patent: 5,798,338

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria263578► subscribe
Canada2194979► subscribe
Germany122007000011► subscribe
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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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