10.04.06
UV Filter
● Patent No. US 7,101,537 B2: Merck AG in Darmstadt, Germany, has patented tricyclic quinoxaline and quinoline derivatives used as a UV filter.
● Patent No. US 7,101,537 B2: Merck AG in Darmstadt, Germany, has patented tricyclic quinoxaline and quinoline derivatives used as a UV filter.