Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4734272 | Phospho-gypsum recovery process | Silvio J. Spigolon | 1988-03-29 |
| 4608238 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid | Silvio J. Spigolon | 1986-08-26 |
| 4477283 | Process and apparatus for producing hydraulic cements | — | 1984-10-16 |
| 4415543 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid | Silvio J. Spigolon | 1983-11-15 |
| 4388117 | Process and apparatus for producing portland and other hydraulic cements | — | 1983-06-14 |
| 4312842 | Process of manufacture of phosphoric acid with recovery of co-products | Silvio J. Spigolon | 1982-01-26 |
| 4213791 | Process for producing portland and other hydraulic cements | — | 1980-07-22 |