Which of these brand names has NOT become genericized (used as a generic term) in the English language?

In the world of linguistics and product development, certain brand names have become so ubiquitous that they've transformed into generic terms - a phenomenon known as 'genericization' or 'genericide.' These products were so successful that their brand names entered our everyday vocabulary, sometimes to the dismay of trademark lawyers! Test your knowledge about these linguistic crossovers where brand names became common nouns or verbs in English.

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Kindle (Amazon's e-reader)
Google (as a verb meaning to search online)
Kleenex (for facial tissues)
Xerox (as a verb meaning to photocopy)