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Details for Patent: 6,528,678

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Summary for Patent: 6,528,678

Title: Phosgene-free process for preparing carbamates
Abstract:A phosgene-free method for preparing a carbamate from a compound containing an amine group involves reacting the compound with an alkylating agent in the presence of carbon dioxide and cesium carbonate. A reaction can take place under standard pressure and temperature conditions and produces carbamates in a high yield with low by-product formation.
Inventor(s): Lee; Byung H. (Kalamazoo, MI)
Assignee: Pharmacia& Upjohn Company (Kalamazoo, MI)
Application Number:10/000,756
Patent Claim Types:
see list of patent claims
Process; Use;
Patent Metrics:
Source: PatentQuant.com
Field: Organic fine chemistry
Back Citations: 3rd percentile
Forward Citations: 0th percentile

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Premature patent expiration for: 6,528,678

Expiration due to failure to pay maintenance fee

Patent Number Expiration Date
6,528,678 March 04, 2007

International Patent Family for Patent: 6,528,678

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Australia3246102► subscribe
Canada2426466► subscribe
European Patent Office1334084► 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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