Afterward, he completed a brief internship with his father's enamelling company before being sent as an intern to Épernay (Marne) for one year to gain further experience.

In 1889, he moved to Annweiler am Trifels, where he purchased 16,070 m2 of land east of the Bernsbacher Mühle (Kabigmühle), which included the factory buildings of a former straw manufacturing facility.

For example, an external galvanizing plant was built in Bellheim, and the Neumühle facility served as a production site for measuring tools.

Among his uncompleted projects were a foundry in Annweiler at the Herrenteich, for which he had already acquired land, and the construction of a cold rolling mill near Germersheim with its own loading dock.

[6] After returning from his traineeship in France, Ullrich served as a one-year volunteer with the 1st Squadron of the 2nd Royal Bavarian Uhlan Regiment in Ansbach from 1 October 1878 until 30 September 1879, He was promoted to Vice Sergeant Major of the Reserve with the commendation "outstanding conduct."

[6] In 1919, Ullrich appointed his son-in-law, Eugen Berthold (1882–1949), to the board of the enamel factory in Annweiler instead of his son.

His son, Franz, a pilot, had tragically died in a plane crash during a training exercise near Traunstein on 10 November 1918, a day before the signing of the Armistice.

[7] In 1925, Gustav Ullrich suffered from a severe thrombosis that confined him to bed for six months until the summer of 1926, preventing him from managing major business operations.

The enamel factory was later acquired by Fissler, Stabila remains owned by Gustav Ullrich's descendants to the present day.