1. The decision made by the Intellectual Property Trial and Appeal Board on July 29, 2013 by the Intellectual Property Trial and Appeal Board is revoked.

2. The costs of the lawsuit are assessed against the defendant.

1. Basic facts

(1) The name of the invention of this case (A) 3: 2) the filing date of the wastewater treatment system (2) / the patent number : on March 7, 2012 / the 18587 (3) the patentee shall be composed of 1 system (S1) and 2 system (S2) the above 1 system (S10); the 2nd reduction of water level (20) the above 1st reduction of water level (20th reduction of water level) the water level of which shall be removed on the upper end of 10 (10th reduction of water level); the 1st reduction (2nd reduction of water level) the above 2nd reduction of water level (20th reduction of water level) the water level of which shall be removed on the upper end of 5th reduction (20th reduction of water level); the 30th reduction of water level (1st reduction of water level) the above 1st reduction of water level shall be removed on the upper end of 20 (20) the above 1st reduction of water level;