A trademark quiz for PR professionals

Pop quiz: What do the following terms have in common?escalatorkerosenecorn flakesyo-yo
These terms were each
coined as a brand name, but were later appropriated by consumers as the generic name for the
product.
According to the International Trademark Association, “these ‘ghost-Marks’ serve as historic and costly reminders of what can
happen to marks if the public comes to regard a brand name as the generic
name of a product.”
If you went through journalism school or hav