Wikipedia:Manual of Style/Trademarks

Trademarks that officially begin with a lowercase letter raise several problems because they break the normal capitalization rules of English that proper names are written with initial capital letters wherever they occur in a sentence.

Note that non-free logos should only be used in the infoboxes of the primary article(s) to which they are affiliated; i.e. a company logo may be used in the article about that company, but not in a separate article about one of the company's products.