Excellent research, ads.
So in a nutshell, March 16 of 2004 Wallin (CEO) proclaims the benefits of the Berlin listing, 5 months later Giffhorn (CFO) decries it and demands it be delisted and nearly 10 years later it still trades.
http://www.businesswire.com/news/home/20030320005230/en/Patriot-Scientific-Corp.-Renegotiates-Outstanding-Warrants-Investors
The subject Swartz warrant "lock up" would have been unlocked around March 20, 2004 - just days after the float of PTSC shares (as PQE) in Germany. Coincidence? Maybe BaFin will find out the answer.
The next question: "Who was the German broker".