Is the Superman S trademarked?

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  1. #trademark
  2. #sided
  3. #first
  4. #superman
  5. #recently
  6. #counterfeiting
  7. #appeared
  8. #infringement
  9. #filed
  10. #iconic
  11. #comics
  12. #remained
  13. #mostly
  14. #diamond
  15. #substituting
  16. #shirt
  17. #copyright
  18. #since
  19. #lawsuit
  20. #unchanged