Comment by ChuckMcM

Well this was the patent they were threatening with as I recall (https://patents.google.com/patent/US20030023912A1/en) and there was this one too: https://patents.google.com/patent/US5576554A/en

Basically the "secret sauce" of the startup recruiting me was that they were going to do wafer scale FPGAs that could be tiled together to build arbitrarily complex systems like military phased array radars and such. All very hush hush but apparently they had recruited some key talent from Xilinx which was annoying Xilinx.