What is Generic Mark?

Legal Definition
A legally unprotected, yet distinguishing mark, in the form of a symbol or a word. This mark definitively categorizes and defines a type of product or service. Some examples are name we all know well: Vaseline, Cellophane, Trampoline and Yoyo. Due to generic usage by consumers and competitors it refers to trademark names of goods and services that lost their trademark protection properties over time.