Answer: The correct answer is "generic names"
Explanation: Certain brand names, such as Kleenex and Rollerblade, fear they could become generic names, because they are so commonly identified with a specific product category that consumers use these names to refer to any product in that category regardless of the manufacturer.
This happens because the products are so identified with the name or logo of the brand that consumers wanting to refer to a certain product call it by the name of the brand.