Last Updated: November 10, 2026

Details for Patent: 4,572,909

Name: Drug Patent Intelligence for US Patent 4572909
Creator: DrugPatentWatch
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Summary for Patent: 4,572,909

Title:	2-(Secondary aminoalkoxymethyl) dihydropyridine derivatives as anti-ischaemic and antihypertensive agents
Abstract:	A dihydropyridine compound of the formula or a pharmaceutically acceptable acid addition salt thereof, wherein Y is -(CH2)2-, -(CH2)3-, -CH2CH(CH3)- or -CH2C(CH3)2-; R is aryl or heteroaryl; R1 and R2 are each independently C1-C4 alkyl or 2-methoxyethyl; and R3 is hydrogen, C1-C4 alkyl, 2-(C1-C4 alkoxy)ethyl, cyclopropylmethyl, benzyl, or -(CH2)mCOR4 where m is 1, 2 or 3 and R4 is hydroxy, C1-C4 alkoxy or -NR5R6 where R5 and R6 are each independently hydrogen or C1-C4 alkyl can be employed for treating or preventing a heart condition or hypertension.
Inventor(s):	Simon F. Campbell, Peter E. Cross, John K. Stubbs
Assignee:	Pfizer Corp SRL
Application Number:	US06/576,982
Patent Claim Types: see list of patent claims	Use; Composition;

Drugs Protected by US Patent 4,572,909

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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: 4,572,909

Foriegn Application Priority Data
Foreign Country	Foreign Patent Number	Foreign Patent Date
United Kingdom	8207180	Mar 11, 1982

International Family Members for US Patent 4,572,909

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Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
European Patent Office	0089167	⤷ Start Trial	SPC/GB93/046	United Kingdom	⤷ Start Trial
Austria	22884	⤷ Start Trial
Australia	1235183	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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