Answer:
In this case science the item is a design, we will have to do certain more case referring to quasi contract. Dewey will have to prove the court that design is his and it is not being used until the discussion made with American. If this is prove in court then the court can accept the case of quasi contract in which the American has willingly used his design to gain monetary benefits without keeping in knowledge to Dewey about the use. In this case the court may grant legal rights of the design to Dewey and would ask to pay penalty to American. Further, usage of design of American must sign legal contract with Dewey about the benefit and usage.