Willi Frei

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St. Gallen, CH

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Patents Grantslast 30 patents

Information Patent Grant
Method and device for separating harmful substances from a flue gas
- Patent number 4,600,561
- Issue date Jul 15, 1986
- Air Frohlich Ag fur Energieruckgewinnung
- Willi Frei
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Process for the production of a tubular heat exchanger, and a tubul...
- Patent number 4,295,522
- Issue date Oct 20, 1981
- Willi Frei
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Tubular heat exchanger and process for its manufacture
- Patent number 4,117,884
- Issue date Oct 3, 1978
- Air Frohlich AG fur Energie-Ruckgewinnung
- Willi Frei
- F28 - HEAT EXCHANGE IN GENERAL