Surely that prima facie just means that courts should proceed with cases [that don't challenge the validity] assuming the mark to be valid once registered rather than that once registered the mark can not be challenged. For example genericisation causes a mark to become invalid despite that mark being registered - surely other objections work the same way.
What I was trying to intimate was that someone with big enough cajones could challenge the validity of the mark as being merely descriptive of some goods (TV broadcasts, say) rather than being a proper indicator of origin of goods/services.
What I was trying to intimate was that someone with big enough cajones could challenge the validity of the mark as being merely descriptive of some goods (TV broadcasts, say) rather than being a proper indicator of origin of goods/services.
ref: http://tsdr.uspto.gov/#caseNumber=0882283, http://tsdr.uspto.gov/#caseNumber=0846056 are some of the early registrations - NFL do appear to have seen off several other registrations and uses to the term "super bowl" (superbol, soul bowl, superbowlz, ...) in court however.