I only know of INSYS that is developing a CINV drug with cannabinoids, and it is transdermal patch I think. Oh wait, CNBX is too, but I think that is just a pump and dump.
I have no idea about patents, I think Vinpat is better at that stuff than me. But I think there are more recent patents for candidates than 1993.
I haven't seen the charts you references, but isn't there a large difference in the bio availability between the three subjects? Also, notice on the next page it is ElSohly's work :P
And how are you comparing it to NB1222? No data is Public about its efficacy right now. That chart in the Nemus presentation was from a ester that Nemus did not select, just used to show the effectiveness of THC pro-drug suppositories compared to dronabinol.