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I have heard that in order to infringe a method claim, the infringer has to do all of the steps of the method. But what if I have a method A, and it has 5 steps, but in order to do A better someone can also do an additional submethod B which has 2 steps. Can these be in one patent? Or are 2 patents needed?

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The word "optionally" can appear in a claim but it is cleaner to make them two distinct claims. One has 5 steps and the other depends from that claim and further comprises the steps f and g. You need two patents if you have two "inventions". –  George White Nov 17 '13 at 4:44

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