Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10696504 | Dock-lift trailer | Michael S. Vollmar | 2020-06-30 |
| 10179712 | Towable dock-lift trailer | Michael S. Vollmar, Robert A. Johnson, Carl Eugene Barbour, Harley James Barbour, Michael Kocur | 2019-01-15 |
| 8539767 | Exhaust treatment system for an internal combustion engine | Kimberly O'Kane, Chijou Wang | 2013-09-24 |
| 7178464 | Rail car door closer | — | 2007-02-20 |
| D326059 | Level | — | 1992-05-12 |
| 4964219 | Combination plumb/level instrument for a try square | — | 1990-10-23 |
| 4874182 | Stroller apparatus for juvenile car seat | — | 1989-10-17 |
| 4638997 | Combination toy and game | — | 1987-01-27 |
| D285326 | Combined crane and trailer toy | — | 1986-08-26 |