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Details for Patent: 3,922,305

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Summary for Patent: 3,922,305

Title: Chemical compounds
Abstract:1. A compound selected from the group consisting of: ##SPC1## 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: ##SPC2## 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): Engelhardt; Edward L. (Gwynedd Valley, PA)
Assignee: Merck & Co., Inc. (Rahway, NJ)
Application Number:04/297,710
Patent Claim Types:
see list of patent claims
Compound;

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International Patent Family for Patent: 3,922,305

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Belgium650988► subscribe
Brazil6461109► subscribe
Switzerland494730► subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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