David J. Thum
5Patents
5h-index
16Co-inventors
56Inventor score
Filing activity: Feb 20, 1991 → Jan 7, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5135447A | Exercise apparatus for simulating stair climbing | Human Necessities | 142 | Expired |
| US5403252A | Exercise apparatus and method for simulating hill climbing | Emerging Cross-Sectional Technologies | 101 | Expired |
| US5741205A | Exercise apparatus pedal mechanism | Human Necessities | 56 | Expired |
| US5238462A | Stair climbing exercise apparatus utilizing drive belts | Human Necessities | 40 | Expired |
| US6829864B2 | Threshold protective cover with hinge | Fixed Constructions | 16 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.