A proprietary eponym is a brand name that has become so popular that it is used as a synonym for all similar products. For example, Kleenex is often used as a synonym for facial tissue, even though there are other brands of facial tissue available. Another example includes Q-Tips which is used as a synonym for cotton swabs. Band-Aid is also a popular proprietary eponym that is often used as a synonym for adhesive bandages. Other examples of proprietary eponyms include Xerox for photocopying, Google for online searching, and Tupperware for plastic food storage containers. However, it is important to remember that these are brand names and not the actual product names.