Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12384430 | Durable railroad brake stick head | John Richard Irwin | 2025-08-12 |
| D1043282 | Railroad brake stick | John Richard Irwin | 2024-09-24 |
| 11597416 | Railroad brake stick | John Richard Irwin | 2023-03-07 |
| D966061 | Railroad brake stick | John Richard Irwin | 2022-10-11 |
| 7650911 | Method for restricting fluid flow in a passageway | David T. Cumming, Emily B. Christopulos | 2010-01-26 |
| 7635008 | Flow restricting device having self-forming conduits | David T. Cumming, Emily B. Christopulos | 2009-12-22 |