Issued Patents 2011
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D647260 | Portable wet/dry vacuum cleaner | Robert R. Hollis, Douglas K. Ritterling | 2011-10-18 |
| D647261 | Combined wet/dry vacuum cleaner with onboard tool storage and integrated dustpan accessory | Douglas C. Schultz, Douglas K. Ritterling | 2011-10-18 |
| D634494 | Combined wet/dry vacuum cleaner | John L. Theising, Douglas K. Ritterling | 2011-03-15 |