What’s the point of putting trade marks symbol on something after the trade mark has expired?

Recently I noticed that the USPS has an iPhone application, and in him they have a postal code search service, except that I really found a brand ZIP code in one place, but it has since expired . What is the purpose of putting the ™ symbol on it, because it is already outdated?

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One Response to “What’s the point of putting trade marks symbol on something after the trade mark has expired?”

  1. DrIG says:

    It is a matter of brand loyalty and identification./

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