Legally perhaps, but if I say Skype the product Skype comes to mind, that's fine, because their company name became a verb. In the other direction however if I

Legally perhaps, but if I say Skype the product Skype comes to mind, that's fine, because their company name became a verb. In the other direction however if I take a word such as "Apple" and name my company that then I gain an advantage that any time anyone who speaks English eats an Apple my company name has the chance to come to mind. This restricts the English language by binding generic words through memory to companies thus diluting their usefulness.