Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8479789 | Self-pumping vent holes for cooling solid rubber tire and method of construction | Duane S. Birdsong | 2013-07-09 |
| 7726049 | Squeegee blade | Duane S. Birdsong | 2010-06-01 |
| 7334617 | Solid rubber tire with flexible hub and replaceable tire tread | Duane S. Birdsong | 2008-02-26 |
| 7198687 | Squeegee blade | Duane S. Birdsong | 2007-04-03 |
| 7174934 | Solid rubber tire including relatively hard rubber layer and relatively soft rubber layer | Duane S. Birdsong | 2007-02-13 |
| 6089292 | Durable, smooth ride wheel and solid rubber tire | — | 2000-07-18 |
| 5313994 | Solid rubber wheel and tire assembly with angled cross bars | Giles A. Hill, Jr., Duane S. Birdsong | 1994-05-24 |
| 5053095 | Method for constructing a wheel and low profile solid rubber tire | — | 1991-10-01 |
| 4966212 | Wheel and solid rubber tire assembly and method | — | 1990-10-30 |