When brand name becomes the name of all products sold like it?

When a brand name becomes synonymous with a product category, it's often referred to as a generic trademark or proprietary eponym. This phenomenon occurs when a brand becomes so dominant that its name is used to describe similar products from various manufacturers, such as "Kleenex" for tissues or "Band-Aid" for adhesive bandages. This can enhance the brand's recognition and market presence, but it also risks losing trademark protection if the name becomes too generic. Companies often take steps to prevent this by encouraging the use of their brand names as adjectives rather than nouns.