Examlex
Costco requires all customers to buy a one-time membership before they can shop. The membership fee is a sunk cost.
Non-Obvious
In the context of patents, it refers to an invention that is not evident to someone with ordinary skill in the particular field of the invention.
Patent
A legal document granting the holder exclusive rights to an invention, design, or process for a certain period.
Obvious
Easily perceived or understood; clear, self-evident, or apparent.
Trade Dress
The visual appearance of a product or its packaging that signifies the source of the product to consumers.
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