FREI, WILLI
Patent Applications and Registrations
Patent applications and USPTO patent grants for FREI, WILLI.The latest application filed is for "flat transparent envelope".
- FREI, WILLI - LOCARNO CH
- Frei; Willi - St. Gallen CH
- Frei; Willi - CH-9016 St. Gallen CH
| Patent | Date |
|---|---|
| Flat Transparent Envelope App 20010022317 - FREI, WILLI | 2001-09-20 |
| Method and device for separating harmful substances from a flue gas Grant 4,600,561 - Frei July 15, 1 | 1986-07-15 |
| Process for the production of a tubular heat exchanger, and a tubular heat exchanger produced according to this process Grant 4,295,522 - Frei October 20, 1 | 1981-10-20 |
| Tubular heat exchanger and process for its manufacture Grant 4,117,884 - Frei October 3, 1 | 1978-10-03 |
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