Since trademarks are adjectives which describe nouns, rather than being nouns themselves, they should not be used in plural form. Rather than pluralizing the trademark, the nouns which they describe should be pluralized. Trademarks are different from trade names, corporate names or business names. Trade names are proper nouns which can be used in the form of a possessive and do not require a generic modifier. Trade names should not be marked with a trademark symbol.
Many companies use their trade names as trademarks.
Trade names, unlike trade marks, can be used in a possessive sense. Properly displaying your trademarks will distinguish your mark from the generic language with which they are used. Preferably this should be the first time the mark appears. Proper marking, discussed below, should also be considered. Additional emphasis can be placed on trademarks by using one of the universally acceptable symbols or methods of indicating trademark status.