As noted above and reported elsewhere in these pages, the lifetime of a U.S. Patent is now twenty years from its effective filing date.[1] For foreigners that might well be 21 years from the filing date in their home country patent application if they wait until the end of the one year time period for filing an application in the United States claiming priority to their home country application under the Paris Convention. In order to give U.S. applicants basically the same privilege, the provisional patent application was created.
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