US Patent Issued to Evonik Operations on June 23 for "Precipitated silicic acids, process for their preparation and use thereof" (German, Swiss Inventors)

ALEXANDRIA, Va., July 15 -- United States Patent no. 12,662,387, issued on June 23, was assigned to Evonik Operations GmbH (Essen, Germany).

"Precipitated silicic acids, process for their preparation and use thereof" was invented by Andre Wehmeier (Bornheim, Germany), Dominik Maschke (Erftstadt, Germany) and Agnieszka Ochenduszko (Attinghausen, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "Precipitated silicas having, a N-cetyl-N,N,N-trimethylammonium bromide (CTAB) surface area less than equal to115 m2/g, a dioctyl adipate (DOA) absorption less than=130 ml/(100 g), a RoTap for less than300 micro metre of less than=86%, and a pore volume distribution of V (d5-d50)/V (d5-d100)greater than0.66. A ...