SpectraShield – patents and permits
![Patents](/images/patente.jpg)
There are several US patents for SpectraShield, and a European patent and its authorisation for Germany through its duplication by the German patent and trademark office.
- US patent No. 5,518,616 / 6,706,384 / 7,279,196
- EU patent No. EP 0726 846 / EP 1 272 342 B1
- German patent No. DE 69 433 479 T2 / DE 60 133 183 T2
- And further patents in Austria, Australia, Spain, Canada
![DIBt geprüft](/images/dibt.png)
SpectraShield has an approval certificate from the Deutsches Institut für Bautechnik (DIBt).
Also interesting is this inspection report by the University of Houston/Texas, which attests that the SpectraShield System has particular resistance to the problem of biogenic sulphuric acid in the sewerage system.