Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5246502 | Method of cleaning valve bushings | Alvin J. Matthews, Ronald M. Markos, Richard H. Gumbert | 1993-09-21 |
| 5211451 | Adjustable regulating device for a railway locomotive brake valve apparatus | Alvin J. Matthews | 1993-05-18 |
| 5146939 | Valve bushing cleaning device and method of cleaning valve bushings | Alvin J. Matthews, Ronald M. Markos, Richard H. Gumbert | 1992-09-15 |