Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5429207 | Rung lock and latch assembly for an extension ladder | William H. Frank | 1995-07-04 |
| 5117943 | Rung lock assembly for an extension ladder | Thomas J. Schmitt | 1992-06-02 |
| 5005280 | Method of manfacturing a foldable ladder structure | Thomas J. Schmitt | 1991-04-09 |
| 4959107 | Method and apparatus for treating ladder rungs for forming assembly with ladder rails | Thomas J. Schmitt, Bruce E. Bogart, John L. Krebs | 1990-09-25 |
| 4834216 | Foldable ladder structure and method of manufacturing the same | Thomas J. Schmitt | 1989-05-30 |
| D300365 | Step ladder | Thomas J. Schmitt | 1989-03-21 |
| D300366 | Step ladder back section | Thomas J. Schmitt | 1989-03-21 |
| D297768 | Step ladder section | — | 1988-09-20 |
| 4766976 | Ladder leg extender and leveler | — | 1988-08-30 |