Each new element in a product claim and each new step in a method claim should be first introduced either as: the subject of its own clause, or a previously introduced and named item or a step comprises it, has it or includes it. Being the subject of its own clause means that it is[…]
Patent Claim identifies the field of the invention. The preamble of an independent claim can summarize the type of invention, identify the relationship between the invention and the prior art, describe how the invention operates upon some external article, and define the purpose of the invention. The preamble should be realistically narrow in scope. For[…]