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Does a product infringe on a patent if it requires the use of the patented product to function?

Background: Let's look at a simplified example. Patent Claim #1: "A system for 'some function X' comprising: a sending device... a receiving device..." Question: If a new product provides the ...
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First Sale Doctrine applying to physical goods

In an example scenario when a person purchases a 30 pack of Kleenex then makes and sells lunch packs each of which includes a box of Kleenex. Is this person protected by the First Sale Doctrine to ...