WT

Walter Trefz

FG Filterwerk Mann & Hummel Gmbh: 3 patents #51 of 285Top 20%
📍 Weiler zum Stein, DE: #1 of 2 inventorsTop 50%
Overall (All Time): #1,649,144 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5579744 Crankcase ventilator for internal combustion engines — 1996-12-03
5171342 Filter insert for air filters used in a dust-filled environment — 1992-12-15
4217118 Air intake filter with cyclone separator stage and dust collection pan Rudi Kopf 1980-08-12