Last Updated: November 9, 2026

Details for Patent: 7,553,863

Name: Drug Patent Intelligence for US Patent 7553863
Creator: DrugPatentWatch
License: https://www.drugpatentwatch.com/terms.php

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Which drugs does patent 7,553,863 protect, and when does it expire?

Patent 7,553,863 protects ANTIZOL and is included in one NDA.

This patent has nine patent family members in eight countries.

Summary for Patent: 7,553,863

Title:	Ultrapure 4-methylpyrazole
Abstract:	Disclosed is an ultrapure 4-methylpyrazole containing less than 0.1% pyrazole and containing less than 10 ppm each of hydrazine and nitrobenzaldehyde. The ultrapure 4-methylpyrazole is prepared by a novel process so that less than 0.01% of ethylvinyl ether is present.
Inventor(s):	Dayton T. Reardan, Michel D. Combe
Assignee:	Endo Operations Ltd
Application Number:	US11/279,708
Patent Claim Types: see list of patent claims	Composition; Compound; Process;

Drugs Protected by US Patent 7,553,863

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
Par Pharm Inc	ANTIZOL	fomepizole	INJECTABLE;INJECTION	020696-001	Dec 4, 1997		DISCN	Yes	No	7,553,863	⤷ Start Trial	Y	Y			⤷ Start Trial
>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 7,553,863

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Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
Australia	2006240490	⤷ Start Trial
Canada	2605413	⤷ Start Trial
China	101163679	⤷ Start Trial
European Patent Office	1948613	⤷ Start Trial
Japan	2008538560	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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