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ROW 303 · LEG 50 ITEM 9 · DUG NOVEMBER 2026
The class is not empty on this ground, and its holder is named in her own right, not as a co-inventor footnote: Mary Ellen Warchal, of 10272 Jefferson Road, Osceola, Indiana — the residence her patent faces print — was a research chemist of the Miles Laboratories diagnostics programme in Elkhart and a named inventor across two decades of its test-device work. Her inventions, at the size row #296 carries them patent by patent: the "Rainbow test device" and "Controlled hue test device" patents (European grants of 1993; U.S. family grant U.S. 4,898,813, 1990), which made a glucose test strip answer in a controlled spectrum of hues rather than a single shade of blue — the visual language by which a diabetic at home could read a number off a colour — and, under her married name Warchal-Windham, the granted U.S. 7,163,616 B2 of 2007, reagent and electrochemical-sensor technology for detecting analytes, her face still printing Osceola, Indiana, twenty years after the first filings. A 2017 Ascensia application (WO 2017/056002) carries her name again, as Warchal-Windham, on a mobile-device analyte-detection system; its face as reached prints no residence for her, so it is named here as her continuing work and not claimed for this ground. The name change itself is printed, not harmonised away: the faces sign her Warchal in 1986–93 and Warchal-Windham in 2007–17, and she is one woman under both.
The rest of the class, searched: the patent rolls were run for any other woman inventor on an Osceola face, and she stands alone in the record reached. The women who appear beside her on the Miles faces are other grounds' residents — Christina Blaschke of White Pigeon, Michigan, and Barbara J. Mikel of Mishawaka on the 2007 patent — and are not claimed here; the co-inventors who share her 1980s faces are men of Elkhart. No woman inventor of the township's first century was found in Chapman, Howard, or the atlas as read, and none is invented to fill the line. Closure: DUG — one woman inventor of this ground, named in her own right with her patents, her name change, and her two-decade span; the balance of the class searched and printed as no further name found.
Sources: the patent faces at row #296 (EP 0 239 926 B1; EP 0 240 849 B1; U.S. 4,898,813; U.S. 7,163,616 B2, whose face prints both her Osceola residence and her co-inventors' White Pigeon and Mishawaka residences); WO 2017/056002 A1 (Google Patents) for the 2017 application, residence not claimed; USPTO / Google Patents full-text searched for further women inventors on Osceola faces, November 2026, none found.