I was very surprised to learn that Marvel and DC, industry
titans and rivals, have for many decades jointly owned a number of
US Federal trade marks for the term SUPER HEROES (Nos. 1179067, 1140452, 3674448) and SUPER
HERO (No.825835).
These trade mark registrations had been in force for decades,
and protected a variety of goods including t-shirts,
costumes, and toy figures.
The combined forces behind Superman, Batman, Spiderman and
Ironman were no match however for Superbabies Limited, a UK company
that has recently successfully cancelled these USTM
registrations.
Looking into the saga, it appears that DC sent a cease and
desist letter and "attempted to
block" the UK business' efforts to promote SUPER
BABIES ("a team of superpowered superhero babies") in
light of their earlier registered rights in SUPER HEROES.
Superbabies Limited therefore retaliated by filing a Petition to
Cancel the SUPER HEROES registrations - a copy of which can be seen
here.