Oscar Troplowitz invents for German company Beiersdorf…

Oscar Troplowitz invents for German company Beiersdorf the medical plaster patch called Leukoplast, still in use today.

Troplowitz had trained at Heidelberg University and in 1890 he purchased Beiersdorf AG, which at the time was a chemist's shop and laboratory in Hamburg run by Paul Beiersdorf (1836–1896).

Soon afterwards, Troplowitz expanded the company into selling brand-name merchandise as well.

Under Troplowitz's ownership, the company eventually develops several of its own products, including Nivea, Leukoplast, Labello, and a pressure-sensitive tape that will later be known as "Tesafilm".

As did Paul Beiersdorf, Troplowitz maintains a close business relationship with dermatologist Paul Gerson Unna (1850–1929).

It is on a recommendation by Unna that Troplowitz will hire Isaak Lifschütz, a chemist who will become the discoverer of the emulsifying agent Eucerit, the main ingredient in Nivea, a brand that Troplowitz will acquire in 1911 from French company Guerlain.

Troplowitz makes several reforms in regards to worker benefits at Beiersdorf, such as paid vacations, maternity leave, and a 48-hour work week.