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Preserving Claims of Priority in the EPO Via Provisional Claims in the U.S.

By John H. Hornickel
November 30, 2006

The value to U.S. practitioners of provisional patent applications is still being uncovered, even though they arrived more than 10 years ago and were substantially improved more than 7 years ago by allowing convertibility to non-provisional patent applications.

Viewed from one perspective, a provisional patent application costs 20% of the cost of a non-provisional patent application and gives the applicant the benefits of the Paris Convention, while avoiding the onset of search, publication, and examination in the United States. For more from this perspective, see this author's article 'The Third (and Best) Way to Use PCT,' Patent Strategy & Management, Vol. 5, No. 3, July 2004.

With considerable thanks to Robert Watson, European Patent Attorney at Mewburn & Ellis in London, another value of a U.S. provisional patent application has been uncovered: preserving a Paris Convention claim of priority of claims in European patent applications because of the presence of extensive claiming in U.S. provisional patent applications.

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