Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822582 | Process for the removal of heavy metals from acid, phosphate-containing, aqueous media | Johannes A. Janssen | 1989-04-18 |
| 4514365 | Process for recovering a uranium-containing concentrate and purified phosphoric acid from a wet process phosphoric acid containing uranium | Johannes A. Janssen | 1985-04-30 |
| 4507207 | Process for the chemical removal of phosphorus compounds from waste water | Cornelis W. Verhoeve | 1985-03-26 |
| 4450142 | Process for recovering a uranium-containing concentrate and purified phosphoric acid | Johannes A. Janssen | 1984-05-22 |
| 4390507 | Process for recovering yttrium and lanthanides from wet-process phosphoric acid | Johannes A. Janssen | 1983-06-28 |
| 4387077 | Process for the recovery of substantially radium free calcium sulphate, yttrium and lanthanides, as well as calcium sulphate, yttrium and lanthanides obtained by this process | Louis H. M. Ramakers, Johannes A. Janssen | 1983-06-07 |
| 4387083 | Process for the preparation of calcium sulphate anhydrite and calcium sulphate anhydrite obtained by this process | Johannes A. Janssen | 1983-06-07 |
| 4362705 | Process for the preparation of phosphoric acid and calcium sulphate anhydrite as well as phosphoric acid and calcium sulphate anhydrite obtained by this process | — | 1982-12-07 |