Last Updated: August 9, 2026

Details for Patent: 4,772,473

Name: Drug Patent Intelligence for US Patent 4772473
Creator: DrugPatentWatch
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Summary for Patent: 4,772,473

Title:	Nitrofurantoin dosage form
Abstract:	The invention involves a combination sustained release/rapid release pharmaceutical capsule for oral administration of nitrofurantoin comprising, in a capsule shell, a first layer of a first particulate mixture comprising nitrofurantoin, polyvinylpyrrolidone and carboxyvinylpolymer; and a second layer of a second particulate mixture comprising macrocrystalline nitrofurantoin.
Inventor(s):	Vikram S. Patel, Harry L. Welles
Assignee:	Warner Chilcott Pharmaceuticals Inc
Application Number:	US06/874,943
Patent Claim Types: see list of patent claims	Composition; Compound; Dosage form;

Drugs Protected by US Patent 4,772,473

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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

International Family Members for US Patent 4,772,473

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Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
Austria	398166	⤷ Start Trial
Austria	A151687	⤷ Start Trial
Australia	592731	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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