The mark consists of a blue outlined downward droplet with the letters afc inside. The "a" is filled in with blue, the "f" is outlined with blue and is filled in with white, the "c" is a filled in with blue. The word afc is underlined with three red lines in decreasing size order.
AMERICAN FILTER COMPANY
The color(s) red white and blue is/are claimed as a feature of the mark.