Invention and History of Disposable Paper Cup (2)

Nws yog nyob rau hauv 1930s uas pom ib tug era ntawm tshiab tuav khob rau cov dej kub. Ob peb ntawm lawv cov uas tau ua ntaub ntawv patents yog, Sydney R. Koons los ntawm Ohio uas tau ua daim ntawv thov patent rau ib tug tuav mus txuas rau khob ntawv hauv 1933. Lwm tus yog Walter W. Cecil hauv 1936 uas tau tsim lub khob ntawv nrog tes uas zoo li mugs. Tsis ntev los no cov khob uas siv tau tau nrov siv thoob ntiaj teb, thiab thaum kawg muaj ntau tus neeg tsim khoom tsim lub hau tshwj xeeb rau cov khob kas fes pov tseg. Tom qab ntawd William F. Dart thiab nrog nws tus tub William A. Dart, tau tsim cov khob polystyrene ua npuas ncauj hauv xyoo 1957. Lawv txawm sib sau ua ke lub tshuab uas tsim cov khob no. Txog rau thaum xaus ntawm lub xyoo caum, nyob ib ncig ntawm 1967, Philadelphia Alan Frank tau ua ntaub ntawv patent rau lub hau kas fes tearable thiab raws li Frank lub tearable hau, ib tug rub-rov qab tab tau tsim nyob rau hauv 1975.