Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5549059 | Converting paper mill sludge or the like | Thomas Jan Herbert Jansen | 1996-08-27 |
| RE34775 | Lightweight aggregate from flyash and sewage sludge | Glenn A. Heian | 1994-11-01 |
| 5342442 | Lightweight aggregate from flyash and sewage sludge | Glenn A. Heian | 1994-08-30 |
| 5057009 | Lightweight aggregate from flyash and sewage sludge | Glenn A. Heian | 1991-10-15 |