US Patent Issued to Archroma (Switzerland) on June 3 for "Process for the simultaneous tanning and dyeing of collagen containing fibrous material" (British, Swiss, German Inventors)

ALEXANDRIA, Va., June 4 -- United States Patent no. 12,319,973, issued on June 3, was assigned to Archroma (Switzerland) GmbH (Pratteln, Switzerland).

"Process for the simultaneous tanning and dyeing of collagen containing fibrous material" was invented by Darryl Miles Cassingham (Dorset, Great Britain), Georg Roentgen (Freiburg, Germany) and Athanassios Tzikas (Dornach, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A process for the simultaneous tanning and dyeing of collagen containing fibrous material, wherein the said material is treated with a liquor containing at least one reactive dyestuff selected from the group of formula (1) and (2) wherein A1, A2 and A3 are each independently of the o...