Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6576774 | Process for recycling polytrimethylene terephthalate cyclic dimer | Donald R. Kelsey | 2003-06-10 |
| 6509438 | Optimum dipropylene glycol content polytrimethylene terephthalate compositions | Donald R. Kelsey, Kailash Dangayach, Houston Brown, Hans Reitz, Eckhard Seidel +1 more | 2003-01-21 |
| 6245879 | Purification of 1,3-propanediol in carbonyl-containing stream | Donald R. Kelsey, Steven Charles Zronek | 2001-06-12 |
| 5218065 | Polymerization process | Donald R. Kelsey, Dale L. Handlin, Jr. | 1993-06-08 |