| Patents for F28G 13 - Appliances or processes not covered by groups; Combinations of appliances or processes covered by groups (505) | |
|---|---|
| 03/1978 | |
| 03/14/1978 | US4078602 Heat exchanger for recovering waste heat |
| 01/1978 | |
| 01/17/1978 | US4068709 Device for cleaning and heat recovery from the exhaust gases in heat treatment and drying installations |
| 02/1977 | |
| 02/15/1977 | US4007774 Heat exchange apparatus and method of controlling fouling therein |
| 05/1976 | |
| 05/25/1976 | US3958698 Pipe bundle extracting/inserting device |
| 05/04/1976 | US3954187 Pipe bundle key |