Interesting question. “Only an offer which rises to the level of a commercial offer for sale, one which the other party could make into a binding contract by simple acceptance (assuming consideration), constitutes an offer for sale under [35 USC] §102(b).” Group One, Ltd. v. Hallmark Cards, Inc., 254 F.3d 1041,1048 (Fed. Cir. 2001). However, “[i]t is not necessary that a sale be consummated for the bar to operate.” Buildex v. Kason Indus.,Inc., 849 F.2d 1461, 1463-64 (Fed. Cir. 1988) (citations omitted). That is, delivery of the invention is not necessary to bar patentability. Depending on the amount of disclosure at the crowd-funding site, the disclosure itself might start the 1 year clock. If the public can figure out how to make and use the invention from such disclosure, the clock is ticking.