Last Updated: September 24, 2026

Details for Patent: 3,922,305

Name: Drug Patent Intelligence for US Patent 3922305
Creator: DrugPatentWatch
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Summary for Patent: 3,922,305

Title:	Chemical compounds
Abstract:	1. A compound selected from the group consisting of: AND ACID ADDITION SALTS THEREOF WHEREIN R is selected from the group consisting of hydrogen, alkyl having up to 6 carbon atoms, benzyl, or cycloalkyl having up to 8 carbon atoms; Y is selected from the group consisting of hydrogen, chloro, or bromo; and X and X'' are selected from the group consisting of hydrogen, chloro, or bromo. 2. A compound selected from the group consisting of: AND ACID ADDITION SALTS THEREOF WHEREIN R is selected from the group consisting of hydrogen and alkyl having up to 6 carbon atoms.
Inventor(s):	Edward L Engelhardt
Assignee:	Merck and Co Inc
Application Number:	US297710A
Patent Claim Types: see list of patent claims	Compound;

Drugs Protected by US Patent 3,922,305

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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

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Brazil	6461109	⤷ Start Trial
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Germany	1468341	⤷ Start Trial
France	4407	⤷ Start Trial
Netherlands	6408512	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration	>Supplementary Protection Certificate	>SPC Country	>SPC Expiration

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