Bugatti submitted and was approved for five patents in association with the Model 100. I've found three of them which are:
UK patent GB526460 (for the engine/drivetrain)
U.S. patent 2,268,183 (for the cooling method)
U.S. patent 2,279,615 (for the trailing edge flap system)
I am aware he received a patent for the V-tail arrangement but was unable to come up with it checking the European patent search engine (or the U.S. one). It was granted by France in April 1939. I don't know what the fifth patent was for. Bugatti sure put in a ton of patents!
Any ideas? Thanks!