Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847768 | Automatic engine oil change indicator system | Ellen S. Schwartz, Donald John Smolenski, John D. Keersmaekers, Gary J. Wallo | 1989-07-11 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847768 | Automatic engine oil change indicator system | Ellen S. Schwartz, Donald John Smolenski, John D. Keersmaekers, Gary J. Wallo | 1989-07-11 |