Marion O'Brien Donovan: formed at the Lathe Works, patented from Connecticut

1917–1951 · THE WATERPROOF DIAPER COVER, US 2,556,800

The formation: The most famous inventor born in South Bend in the twentieth century learned what invention was at her father's plant. Marion O'Brien was born in this city on 15 October 1917, daughter of Miles W. O'Brien of the South Bend Lathe Works, and the biographies are unanimous on the formation: she spent a large part of her childhood inside the manufacturing plant her father and her uncle John ran, among men who, in the Smithsonian's summary, "invented many things including an industrial lathe" — the gear-cutting and gun-barrel lathes of the works above. Her own inventing was done elsewhere, and the geography is printed as plainly for her as for Bendix: the patent faces read Saugatuck, Connecticut. Living in Connecticut with infant daughters and wartime rubber pants that chafed and leaked, she sewed a waterproof cover from a shower curtain, then from nylon parachute cloth, fastening it with snaps instead of the safety pins that stuck babies and mothers alike, and named it the Boater because it kept its wearer afloat and dry.

Saks Fifth Avenue took it in 1949 and it was an instant success. The patent record: No. 2,556,800, "Diaper Wrap," filed 19 January 1949 and granted 12 June 1951 to Marion Donovan of Saugatuck, Connecticut — the patent the National Inventors Hall of Fame cites for her 2015 induction — and a companion cover patent, No. 2,575,163, filed 5 May 1949 and granted 13 November 1951, assigned to the Kennedy Car Liner & Bag Company of Shelbyville, Indiana, an Indiana destination for a South Bend-born woman's paper. After the first patent she sold her company and the rights to the Keko Corporation for one million dollars, and kept inventing: twenty patents between 1951 and 1996, for a facial-tissue box, a towel dispenser, a hosiery clasp, a storage box, a closet organizer, dental-floss devices — a working life of household invention.

The popular claim needs its usual trimming: Donovan did not invent the disposable diaper, which Procter & Gamble's Victor Mills commercialized as Pampers a decade later; what she invented, patented, and sold was the waterproof cover that made cloth diapering workable and stands as the disposable's documented precursor — the Smithsonian's verdict, and a sufficient honor. She died in 1998; her papers, seventeen boxes of notes, drawings, patents and orders, rest at the National Museum of American History. South Bend's share in her is the share the record gives: the birth, the childhood in the plant, and the machine-shop formation behind the patents — the inventions themselves are Connecticut work, and this section claims no more for the city than it can prove.

Sources:

1. U.S. Patents Nos. 2,556,800 (filed 19 January 1949, granted 12 June 1951) and 2,575,163 (filed 5 May 1949, granted 13 November 1951) — the patents themselves, via the Patent Office images and Google Patents: Marion Donovan of Saugatuck, Connecticut; the latter assigned to Kennedy Car Liner & Bag Co., Inc., Shelbyville, Indiana.
2. National Inventors Hall of Fame, "Marion Donovan" (inducted 2015) — U.S. Patent No. 2,556,800; born 15 October 1917; the Saks Fifth Avenue launch of 1949; the sale to Keko Corp. for $1 million.
3. Smithsonian Magazine, "Meet Marion Donovan, the Mother Who Invented a Precursor to the Disposable Diaper" (2019) — born Marion O'Brien in South Bend, Indiana, 1917; the plant childhood; the Boater of parachute cloth; the twenty patents; her papers at the National Museum of American History.
4. The standard biographies (Encyclopedia.com / Wikipedia, citing the Smithsonian record) — the twenty patents of 1951–1996 and their subjects; her father and uncle credited with the South Bend lathe line for automobile gears and gun barrels.