Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6234137 | Engine lubricating apparatus and method of operating an engine having such an apparatus | Andrew R. Spriegel | 2001-05-22 |
| 4628241 | Start-up control method and apparatus for polyphae induction motor | Raymond E. Bristow, David C. Groom | 1986-12-09 |
| 4581568 | Method and apparatus for automatically setting the demand phase lag input to an induction-motor power factor controller | David C. Groom, Raymond E. Bristow | 1986-04-08 |