ALEXANDRIA, Va., July 16 -- United States Patent no. 12,360,429, issued on July 15, was assigned to E Ink Corp. (Billerica, Mass.).
"Electrophoretic display device" was invented by Xiaolong Zheng (Fremont, Calif.) and Craig Lin (Fremont, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electrophoretic medium comprises a fluid and first, second, third and fourth types of particles (W, Y, R, B) having four different colors. The first and third particles have charges of one polarity and the second and fourth particles charges of the opposite polarity; the first particles have a greater zeta potential or electrophoretic mobility than the third particles, and the second particles a greater zeta potential ...