Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872432 | Oilless internal combustion engine having gas phase lubrication | Vemulapalli D. N. Rao | 1989-10-10 |
| 4861243 | Diesel fuel injection pump with variable injection timing | — | 1989-08-29 |
| 4846051 | Uncooled oilless internal combustion engine having uniform gas squeeze film lubrication | Vemulapalli D. N. Rao, Peter H. Havstad | 1989-07-11 |