US Patent Issued to GPCP IP Holdings on Oct. 7 for "High yield chemical pulping and bleaching process" (Wisconsin Inventors)

ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,435,469, issued on Oct. 7, was assigned to GPCP IP Holdings LLC.

"High yield chemical pulping and bleaching process" was invented by Jeffrey A. Lee (Neenah, Wis.) and Kevin M. Holtman (Appleton, Wis.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of producing high yield chemical cellulosic pulp includes: (a) chemically pulping wood chips to separate lignin and liberate cellulosic fibers from the wood chips to generate a cellulosic pulp; (b) washing and screening the pulp of step (a); (c) pre-treating the washed pulp with oxygen; (d) optionally washing the treated pulp of step (c); (e) bleaching the pre-treated pulp in an extended duration oxidat...