Issued Patents 2016
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D772806 | Battery | Douglas K. Ritterling | 2016-11-29 |
| 9456722 | Backpack vacuum cleaner | Mark J. Tomasiak, Douglas K. Ritterling | 2016-10-04 |
| 9282861 | Wet/dry vacuum cleaner with built-in dustpan accessory | Douglas C. Schultz, Douglas K. Ritterling | 2016-03-15 |