Top Inventors at Koppers Delaware All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | John W. Mospan | 11 |
| 2 | W. Thomas Urmson, Jr. | 6 |
| 3 | William T. Urmson, Jr. | 4 |
| #4 | Billy Jay Cairns | 3 |
| #5 | Carl Camille Mueller | 3 |
| #6 | James T. Dietz | 3 |
| #7 | John M. Downey | 3 |
| #8 | Ronald K. Junk | 3 |
| #9 | Steven D. Singleton | 3 |
| #10 | David R. Snyder | 2 |
| #11 | Donald A. Bielski | 2 |
| #12 | James A. Remington | 2 |
| #13 | John Thomas Baron | 2 |
| #14 | Kenneth C. Krupinski | 2 |
| #15 | Michael Bech Malmqvist | 2 |
| #16 | Patrick J. Boario | 2 |
| #17 | Robert H. Wombles | 2 |
| #18 | Thomas A. Golubic | 2 |
| #19 | William E. Saver | 2 |
| #20 | Brian R. Jones | 1 |
| #21 | Daniel P. Gray | 1 |
| #22 | Jun Zhang | 1 |
| #23 | Kevin J. Costanzo | 1 |
| #24 | Peter Tham | 1 |
| #25 | Richard Jarosinski | 1 |
| #26 | Stacey McKinney | 1 |