Inventor · disambiguated record
Willi Frei
Also filed as: FREI WILLI
7 granted patents·135 citations·filing 1976–1999
87Inventor score
Top patents by PatentIndex Score
7 records- 0175US4117884ATubular heat exchanger and process for its manufactureFROEHLICH AIR AG·Filed 1976·Granted Oct 3, 1978·27 cites·7 claims
- 0273US4295522AProcess for the production of a tubular heat exchanger, and a tubular heat exchanger produced according to this processFREI WILLI·Filed 1978·Granted Oct 20, 1981·31 cites·3 claims
- 0364US4600561AMethod and device for separating harmful substances from a flue gasFROEHLICH AIR AG·Filed 1984·Granted Jul 15, 1986·23 cites·22 claims
- 0464US4414882APneumatic drive for switching elements and control elementsVAT AG·Filed 1981·Granted Nov 15, 1983·23 cites·5 claims
- 0562US4982511AProcess and apparatus for kiln-drying maltFROEHLICH AIR AG·Filed 1989·Granted Jan 8, 1991·13 cites·22 claims
- 0649US4224982ATubular heat exchangerFREI WILLI·Filed 1978·Granted Sep 30, 1980·15 cites·4 claims
- 0730US6332570B2Flat transparent magnifying envelopeFiled 1999·Granted Dec 25, 2001·3 cites·12 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →