What are examples of abstract ideas “having no particular concrete or tangible form”?

The category of abstract ideas “having no particular concrete or tangible form” is a catch-all category for abstract ideas that don’t fit neatly into the other three categories (mathematical concepts, certain methods of organizing human activity, and mental processes) as described in MPEP 2106.04(a). While the MPEP doesn’t provide an exhaustive list, it does offer…

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