Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882736 | Method for efficiently using flue gas energy in a glass furnace | — | 1989-11-21 |
| 4852118 | Energy saving method of melting glass | — | 1989-07-25 |
| 4829058 | Substituted bis-(4-aminophenyl)-sulfones | Joachim K. Seydel, Gerd Kruger, Klaus Noll, Johannes Keck, Uwe Lechner | 1989-05-09 |
| 4797092 | Cullet preheater | — | 1989-01-10 |