Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6402124 | Carburetor fuel mixture adjustment assembly | George M. Pattullo, David L. Speirs | 2002-06-11 |
| 5711901 | Carburetor having temperature-compensated purge/primer | David L. Berg, Matthew A. Braun | 1998-01-27 |
| 5322645 | Carburetor needle valve adjustment limiter cap and method of use | Steven L. Hammett, George M. Pattullo, David L. Speirs, James E. Van Allen, Mark S. Swanson | 1994-06-21 |
| 5015128 | Rotary drill apparatus | Donald C. Ross | 1991-05-14 |