I was not aware the sample was taken from a patch...can you point me to a source on that?
Please everyone note that there is a theory (well, maybe more than a theory at this point) that persuasively argues the C-14 sample came from an invisibly-rewoven area of the Shroud and contained medieval fibers which threw off the result:
http://www.shroudstory.com/shroud-of-turin-for-journalists.htm
Until this theory is completely disproven, a first-century date for the cloth is still very much on the table.