Because the idea is brandnew, we did it right and got it patented (german) PDF-File.

Meanwhile the patent was also successfully granted in the United States of America: PDF-Datei US9435671. Date: 2016/09/06

Granted also in Russia: PDF-Datei RU2014146709A.pdf. Date: 2017/05/11 under RU2619024 (C2)

After that, China has also granted a patent on my drums: PDF-Datei CN104285251A.pdf. Date: 2017/10/24 under CN104285251 (B)

a few other countries still have the "Patent Pending" status and will follow... a new drum goes around the world!