Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6303030 | Ferrographic apparatus | John B. Desjardins, William W. Seifert, Robert S. Wenstrup | 2001-10-16 |
| 6156208 | Ferrographic method | John B. Desjardins, William W. Seifert, Robert S. Wenstrup | 2000-12-05 |
| 5714059 | Flow unit for ferrographic analysis | William W. Seifert, John B. Desjardins | 1998-02-03 |
| 5309213 | Optical determination of amount of soot in oil sample | John B. Desjardins, William W. Seifert | 1994-05-03 |
| 4669316 | Differential-pressure apparatus employing a resonant force sensor | Everett O. Olsen, Anthony C. Gilby, Gordon W. Chitty | 1987-06-02 |
| 4486731 | Coil assembly with flux directing means | — | 1984-12-04 |
| 4187170 | Magnetic techniques for separating non-magnetic materials | John P. Bowen | 1980-02-05 |