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A good strategy is filing continuing patent to close holes in claims, so here is my question:

Can continuing patent application be filed the same as the prior application or it must have some changes in claim?

If the first is allowed then filing continuing application is much easier to keep application alive for following market's design-around, just file it again and again. If it is not allowed then should the first application be filed with maximum scope, or keep something for continuing application?

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It is perfectly allowable to file with the exact claims that were allowed (or rejected) in the parent application. If you do not amend before it becomes examined then you should get a double patenting rejection in the first case and a repeat of the rejection + a double patenting for the second case. –  George White Aug 6 at 23:17

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