The possible contenders for the title of inventor of spray paint were actually working across decades. And really, all those people contributed pieces of the story.

Research:

Abplanalp, R.H. “Valve mechanism for dispensing gases and liquids under pressure.” U.S. Patent Office. March 17, 1953. https://patentimages.storage.googleapis.com/e2/65/be/710e864cf870d8/US2631814.pdf
“About Binks.” https://binks.com/about-us/
Andreassen, Dag. “The world's first spray can?” Teknismuseum. Nov. 6, 2024. https://www.tekniskmuseum.no/en/stories/spray-can
“Atomizer.” Smithsonian National Museum of American History. https://americanhistory.si.edu/collections/object/nmah_721925
Baisya, Pramila. “A Brief History of Spray Paint.” UP Magazine. https://upmag.com/a-brief-history-of-spray-paint/
Bancroft, Hubert Howe. “The book of the fair; an historical and descriptive presentation of the world's science, art, and industry, as viewed through the Columbian Exposition at Chicago in 1893.” The Bancroft Co. 1893. https://archive.org/details/bookfair1banca/page/68/mode/2up
Bellis, Mary. "The History of Aerosol Spray Cans." ThoughtCo, May. 11, 2025, thoughtco.com/history-of-aerosol-spray-cans-1991231
“Boss of the Year Secretary Speaker in Sycamore.” The Sycamore Tribune. April 29, 1960. https://www.newspapers.com/image/898198730/?match=1&terms=Edward%20H.%20Seymour
“Definitions of “Aerosol Product” and Related Terms in Various Federal and State Regulations, Standards and Codes.” National Institute od Standards and Technology. February 2012. https://www.nist.gov/system/files/documents/pml/wmd/Definitions-of-Aerosol-Product.pdf
“DeVilbiss Atomizers.” Wood Library Museum of Anesthesiology. https://www.woodlibrarymuseum.org/museum/devilbiss-atomizers/
“Francis Davis Millet and Millet family papers, 1858-1984, bulk 1858-1955.” Smithsonian. https://www.aaa.si.edu/collections/francis-davis-millet-and-millet-family-papers-9048/biographical-note
Greenbaum, Hillary and Dana Rubinstein. “The Origin of Spray Paint.” New York Times magazine. Nov. 4, 2011. https://www.nytimes.com/2011/11/06/magazine/who-made-spray-paint.html
Haberkorn, Stephen. “Seymour of Sycamore: Aerosol Paint Inventor Still Mass Producing.” The Daily Chronicle. May 31, 2014. https://www.newspapers.com/image/183344909/?match=1&terms=%22Nancy%20Seymour%20Heatley%22
Linden, Chris. “The 1893 Columbian Exposition: Remembering Chicago’s White City.” Northwest Quarterly. Dec. 10, 2012. https://northwestchicagoland.northwestquarterly.com/2012/12/10/the-1893-columbian-exposition-remembering-chicagos-white-city/
“Oslo, Home of the Spray Can.” Oslo Science Park. Sept. 24, 2024. https://www.forskningsparken.no/en/news/2024-oslo-home-of-the-spray-can
“A Patent on a Rattle in a Can.” The Lemont Herald. May 22, 1952. https://www.newspapers.com/image/700713398/?match=1&terms=%22Edward%20H.%20Seymour%22
Rotheim, Erik. “METHOD AND MEANS FOR THE ATOMIZING OR IDISTRIBUTION OF LIQUID OR SEMI-LIQUID MATERIALS.” United States Patent Office. April 7, 1931. https://patentimages.storage.googleapis.com/f5/fb/c3/05208e6542c01c/US1800156.pdf
Seymour, E.H. “HERMETICALLY SEALED PACKAGE FOR MIXING AND DISCHARGING ” Dec. 25, 1951. https://patentimages.storage.googleapis.com/c0/4b/45/2677a2b12e2430/US2580132.pdf
“Seymour Man Develops New Spray Device.” The Daily Chronicle. May 27, 1952. https://www.newspapers.com/image/126585367/?match=1&terms=%22Edward%20H.%20Seymour%22
“Summary of the Clean Air Act.” EPA. https://www.epa.gov/laws-regulations/summary-clean-air-act

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SYMHC Classics: Rabies

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Stuff You Missed in History Class