Inventor · disambiguated record
Walter Trefz
Also filed as: TREFZ WALTER
3 granted patents·117 citations·filing 1978–1995
76Inventor score
Files withMANN & HUMMEL FILTER3
Top patents by PatentIndex Score
3 records- 0182US5171342AFilter insert for air filters used in a dust-filled environmentMANN & HUMMEL FILTER·Filed 1991·Granted Dec 15, 1992·47 cites·6 claims
- 0280US5579744ACrankcase ventilator for internal combustion enginesMANN & HUMMEL FILTER·Filed 1995·Granted Dec 3, 1996·41 cites·6 claims
- 0367US4217118AAir intake filter with cyclone separator stage and dust collection panMANN & HUMMEL FILTER·Filed 1978·Granted Aug 12, 1980·29 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →