Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8177872 | Raincap precleaner, motor vehicle having a raincap precleaner, and method for precleaning air | Benny K. Nelson, John David Kuhn | 2012-05-15 |
| 6085383 | Vacuum cleaner brush wrap geometry | Richard F. Wulff, Daniel G. Giddings, Dick Mason | 2000-07-11 |
| 5711775 | Sweeper with electromagnetic filter cleaning | Bruce F. Field | 1998-01-27 |
| 5659921 | Sweeper with double side skirts for dust control | — | 1997-08-26 |
| 5377473 | Insulating glass unit with insulative spacer | James E. Larsen | 1995-01-03 |