Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4390644 | Isocyanurate foams using a sulfonium zwitterion/metal carbonylate mixture as catalyst | Donald H. Clarke, Donald L. Schmidt | 1983-06-28 |
| 4335219 | Process for reacting isocyanates in the presence of quaternary ammonium zwitterions | Donald H. Clarke, Donald L. Schmidt | 1982-06-15 |