Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6082322 | Electronically controlled continuous lubricating oil replacement system | John P. Graham, Jerry C. Wang, Leslie A. Roettgen, Donald P. Carver, David M. Stehouwer +1 more | 2000-07-04 |
| 5970942 | Electronically controlled continuous lubricating oil replacement system | David E. Koeberlein, Paul D. Cantrell, Eric S. Keith, John P. Graham, Jerry C. Wang +4 more | 1999-10-26 |
| 5881688 | Electronically controlled continuous lubricating oil replacement system | John P. Graham, Jerry C. Wang, Leslie A. Roettgen, Donald P. Carver, David M. Stehouwer +1 more | 1999-03-16 |
| 5749339 | Electronically controlled continuous lubricating oil replacement system | John P. Graham, Jerry C. Wang, Leslie A. Roettgen, Donald P. Carver, David M. Stehouwer +1 more | 1998-05-12 |