On May 27, 2015, the Board issued a final written decision in Organik Kimya AS v. Rohm & Hass Co., IPR2014-00185, confirming the patentability of all challenged claims of U.S. Patent No. 6,020,435.

The ‘435 patent is directed to a chemical process for preparing low-density “hollow” or “voided” multi-stage emulsion polymers used in coating compositions such as paints. These emulsion polymers are generally prepared by swelling a core/shell emulsion polymer in such a way that one or more voids form in the interior of the emulsion polymer particle.
Continue Reading PTAB Upholds Claims Directed to Chemical Process Based on Expert Testimony and Experimental Evidence