Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7153978 | Method for purifying N-methyl-2-pyrrolidone | Andrew P. Kahn | 2006-12-26 |
| 5651916 | Process for the preparation of a propylene glycol antifreeze containing an alkali metal silicate | — | 1997-07-29 |