[…] Google is one of the most valuable brands in the world. According to Forbes magazine, it ranks third with an estimated brand value of $66 billion, behind Apple and Microsoft. The company vigilantly defends its trademark, both in and out of court. It’s in no imminent danger of losing its trademark protection. But given the popularity of Google’s brand, and how it has entered mainstream English usage as a verb (to google) and participle (googling), it may only be a matter of time.

If so, it will join the distinguished company of aspirin, cellophane, thermos, escalator, dry ice and trampoline — all once-prominent brand names that lost their legal status as protected trademarks after entering mainstream usage. Webster’s itself has been genericized as a synonym for dictionary, and the name can be used by anybody, even though it’s owned by Encyclopaedia Britannica.

Thanks to zealous policing by their corporate owners, Band-Aid (Johnson & Johnson) and Kleenex (Kimberly-Clark) still cling to protected trademark status, but are so much a part of common usage “they’re almost 100 percent of the way to genericization,” said Grant Barrett, a lexicographer and co-host of a public radio show about language, “A Way With Words.”

Xerox, FedEx, TiVo, Skype and Photoshop face similar issues. All are trademarked names commonly used as verbs.

Google, however, is hurtling toward genericization with unprecedented speed, according to linguistics experts. The word google was derived from the mathematical term googol — the numeral one followed by 100 zeros, or 10 raised to the 100th power. It was registered as a domain name by the company in 1997. Its first known use as a part of speech came just a year later, when Mr. Page appended the phrase “Have fun and keep googling!” to an email announcing new search features. More.

See: The New York Times

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