He himself served in WW2, but only in staff and training posts.
According to a site I can't find now:The trial against Patzig was stopped on March 20, 1931 in virtue of the laws of amnesty from July 14, 1927 and October 24, 1930 for all crimes of war which had a political character.
After recognizing his error
[i.e. sinking a hospital ship], the intention of the "criminal" action of Patzig
[i.e. shooting at the survivors] was to avoid a new propaganda campaign against Germany. So the court considered that his action had a political character.
On his further career, there's this from http://perso.orange....arin/patzig.htm
And there the trail goes cold.
Does this help?
Yes it definitely helps though I generally knew that the Weimar Republic had officially legally repudiated much of the Liepzig war crimes trails results in the latter 1920s and early 30's before Hitler came to power and repudiated the entire Versailles Peace Treaty in 1933.
However I am NOT sure that the ww1 Patzig was the same as the WW2 U-boat Patzig. It is possible. If I remember from my notes Patzig was relatively old as a uboat commander in ww1 itself. I think he was born in the 1880s so that he would have been pretty old by ww2. There were of course Patzig families from the German Polish area (Danzig specificaly now Gdansk,Poland) and it is possible that the ww2 Patzig was a close enough relative.
Any of our German subscribers: can you help out?