"..many a company has gone to court to protest and protect their trademark. "

Ah yes...to prevent others from USING their trademark name! All *I* meant was that they are quite happy to hear folks saying.."Oh dear...we need more Kleenex...or Jello." ..etc.

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"...because jelly over there means jam, so you don't have a proper word for jelly, do you?"

au contraire, mon ami! Jelly does NOT mean jam. There is jelly, jam, preserves... and Jello.

    In jelly, the fruit comes in the form of (only) fruit juice.
    In jam, the fruit comes in the form of fruit pulp or crushed fruit (and is less stiff than jelly as a result).
    In preserves, the fruit comes in the form of chunks in a syrup or a jam.