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Serving leading biopharmaceutical companies globally:

Cantor Fitzgerald
Harvard Business School
Farmers Insurance
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US Army

Generated: December 13, 2017

DrugPatentWatch Database Preview

Details for Patent: 4,680,312

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Summary for Patent: 4,680,312

Title: Stable prostaglandin E gels utilizing colloidal silicon dioxide as a gel-forming agent
Abstract:The present invention provides an improved class of stable gels of prostaglandin E compounds prepared from solutions of prostaglandin E compounds in a pharmaceutically acceptable, stabilizing organic solvent, e.g., triacetin, gelled by the addition of colloidal silicon dioxide.
Inventor(s): Johnson; Brian S. (Crawley, GB)
Assignee: The Upjohn Company (Kalamazoo, MI)
Application Number:06/674,357
Patent Claim Types:
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Dosage form;

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Foreign Priority and PCT Information for Patent: 4,680,312

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
United Kingdom8208322Mar 22, 1982

International Patent Family for Patent: 4,680,312

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Germany3381898► Subscribe
Denmark127883► Subscribe
Denmark167139► Subscribe
European Patent Office0089768► Subscribe
Finland81962► Subscribe
Finland830890► Subscribe
Hong Kong91993► Subscribe
JapanH0322850► Subscribe
JapanS58167509► Subscribe
Norway163042► 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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Serving leading biopharmaceutical companies globally:

Cantor Fitzgerald
Harvard Business School
Johnson and Johnson
Express Scripts

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