What are the criteria for establishing distinctness between a combination and subcombination?

What are the criteria for establishing distinctness between a combination and subcombination? To establish distinctness between a combination and subcombination, two criteria must be met: 1. The combination as claimed does not require the particulars of the subcombination as claimed for patentability (e.g., to show novelty and unobviousness). 2. The subcombination has utility by itself…

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