Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D646044 | Barrel rack | Darrell A. Oltman, Herbert H. Spann | 2011-09-27 |
| D628353 | Barrel rack | Herbert H. Spann | 2010-11-30 |
| D628354 | Barrel rack | Herbert H. Spann | 2010-11-30 |
| D628355 | Barrel rack | Herbert H. Spann, Darrell A. Oltman | 2010-11-30 |
| 7475796 | Industrial hopper with support | — | 2009-01-13 |
| RE39721 | Discharge outlet for double wall containment tank assembly | — | 2007-07-10 |
| 7195284 | Flexible synthetic resin coupling | Darrell A. Oltman | 2007-03-27 |
| 7059575 | Industrial tank support | — | 2006-06-13 |
| 6484899 | Fluid tank assembly | — | 2002-11-26 |
| 6474496 | Containment tank assembly | — | 2002-11-05 |
| 6318581 | Discharge outlet for double wall containment tank assembly | — | 2001-11-20 |
| 6247594 | Fluid tank assembly | — | 2001-06-19 |
| 6193099 | Rotationally molded part having integrally formed reinforcement | Todd Bolzer | 2001-02-27 |
| 6079580 | Molded tank | H. Todd Bolzer | 2000-06-27 |