Television Talk

Tihanyi's American Patents 
(some of these inventions was patented in Germany 1 year earlier.)

http://www.google.com/patents?id=lx1mAAAAEBAJ&printsec;=abstract&zoom;=4&source;=gbs_overview_r&cad;=0

http://www.google.com/patents?id=FD8BAAAAEBAJ&printsec;=abstract&zoom;=4&source;=gbs_overview_r&cad;=0

And an 1946 improvment:
http://www.google.com/patents?id=2p9hAAAAEBAJ&printsec;=abstract&zoom;=4&source;=gbs_overview_r&cad;=0

What are the differences between the patented devices, and what was the essence and impact of these differences ?