Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6132696 | Manufacture of precipitated calcium carbonate of improved color and stable crystalline form | Alvin Lee Porter | 2000-10-17 |
| 5939036 | Manufacture of precipitated calcium carbonate | Alvin Lee Porter | 1999-08-17 |