Claim date

Usually the date when a patent application is filed. It can be moved back; for example, a claim in application A filed in Canada on 1 February 1996 can be bumped by a claim in application B filed as late as 31 January 1997, if B is based on an application filed in a Paris Convention or WTO state on 31 January 1996 (up to twelve months earlier). B has priority based on its earlier claim date: it will get a patent covering its claim, and A will not.

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