Last Updated: November 9, 2026

Details for Patent: 4,521,431

Name: Drug Patent Intelligence for US Patent 4521431
Creator: DrugPatentWatch
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Summary for Patent: 4,521,431

Title:	Aminoalkyl furan derivative
Abstract:	A novel crystal form of ranitidine (N-[2-[[[5-(dimethylamino)methyl]-2-furanyl]methyl]thio]ethyl-N'-methyl-2-nitro-1,1-ethenediamine) hydrochloride, designated Form 2, and having favorable filtration and drying characteristics, is characterized by its infra-red spectrum and/or by its x-ray powder diffraction patterns.
Inventor(s):	Derek L. Crookes
Assignee:	Glaxo Group Ltd
Application Number:	US06/406,710
Patent Claim Types: see list of patent claims	Use; Composition; Dosage form;

Drugs Protected by US Patent 4,521,431

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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

Foreign Priority and PCT Information for Patent: 4,521,431

Foriegn Application Priority Data
Foreign Country	Foreign Patent Number	Foreign Patent Date
United Kingdom	8031634	Oct 01, 1980

International Family Members for US Patent 4,521,431

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Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
Austria	389696	⤷ Start Trial
Austria	402069	⤷ Start Trial
Austria	407956	⤷ Start Trial
Austria	A109189	⤷ Start Trial
Austria	A223188	⤷ Start Trial
Austria	A422281	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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