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- 1916 – Patterson Screen Company Founded by Carl Patterson in Towanda, PA, USA
- 1941 – Sylvania Hygrade purchases Patterson Screen Company
- 1943 – Tungsten powder produced for the US Government
- 1959 – Sylvania merged with General Telephone, becoming General Telephone & Electronics (GTE)
- 1971 – Tungsten metal powder production begins at HMZ in Bruntál, Czech Republic
- 1990 – Tungsten scrap processing begins at HMZ
- 1993 – Siemens purchases Sylvania from GTE
- 2000 – Siemens purchases HMZ
- 2008 – The Plansee Group purchases GTP (Towanda and Brantál) from Siemens
- 2012 – APT capacity expansion
- 2015 – GTP acquires Tikomet Oy in Jyväskylä, Finland
- 2023 – GTP strengthens production capacity in Europe with the incorporation of GTP Luxembourg
