If the arrows were used or sold publicly earlier, they are (almost certainly) prior art. This doesn't necessarily mean the patent is invalid, though. Folks ge

If the arrows were used or sold publicly earlier, they are (almost certainly) prior art. This doesn't necessarily mean the patent is invalid, though. Folks generalize excessively when discussing what a patent covers. You'd have to compare the patent's claims to the prior art arrows to decide if exactly what is claimed was done before.