Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33690 | Level sensor | Andrew B. Maitland, David R. Hill, William E. Banton, Lee M. Richey, David Taylor | 1991-09-17 |
| 4747451 | Level sensor | David R. Hill, Lee M. Richey, Andrew B. Maitland, William E. Banton, David Taylor | 1988-05-31 |
| 4570718 | Oil level sensor system and method for oil wells | — | 1986-02-18 |
| D273944 | Thermostat | David F. Koeneman, Robert W. Blee | 1984-05-22 |
| 4312226 | Comparator | Wesley L. Taylor, James B. Blanchard | 1982-01-26 |