Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5393081 | Hand truck assemblies and methods of constructing and operating them | — | 1995-02-28 |
| 5253410 | Retractable underbody truck ramp and method of making | — | 1993-10-19 |
| 5207439 | Improvements in hand trucks with pivotally connected, spreadable, wheel-supported, auxiliary support frames | — | 1993-05-04 |
| 5199150 | Method of constructing a retractable underbody truck ramp | — | 1993-04-06 |
| 5167246 | Rapidly erectable and strikeable shelter frame system and methods of erecting and striking such systems | — | 1992-12-01 |
| 5042827 | Automatically shifting stair climber structure for a repositionable hand truck | — | 1991-08-27 |
| 4865340 | Two-wheeled hand truck construction | — | 1989-09-12 |
| 4790547 | Two-wheeled hand truck construction | — | 1988-12-13 |
| 4762333 | Repositionable hand truck | — | 1988-08-09 |
| 4563014 | Two-wheeled hand trucks | — | 1986-01-07 |
| 4420166 | Stair climber for hand trucks | Don C. Law, Paul R. Ripple, Roger S. Eckhardt | 1983-12-13 |
| 4275894 | Hand truck construction assembly | — | 1981-06-30 |