ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,441,897, issued on Oct. 14, was assigned to Evonik Operations GmbH (Essen, Germany).
"Polyamidoamine dispersants" was invented by Ming Choon Sze (Singapore), Sunil Shinde (Singapore), Haihua Tang (Singapore), Kerh Li Liu (Singapore) and Christoph Durr (Monheim am Rhein, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A pigment dispersant can be obtained by reacting amine-rich moieties C with at least one polymer P having one or more amine reactive groups. The amine-rich moieties C have an amine density of at least 600 mg KOH/g and are obtainable from repetitive self-reaction of at least one type of substance B and/or from cross-reaction of at lea...