Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5700525 | Passivation method and composition for galvanized metal surfaces | William L. Harpel | 1997-12-23 |
| 5693371 | Method for forming chromium-free conversion coating | Edward A. Rodzewich, Joseph E. Murphy | 1997-12-02 |
| 5662967 | Non-chromium passivation method for galvanized metal surfaces | — | 1997-09-02 |
| 5641537 | Composition for and method of monitoring dried-in-place non-chrome polyacrylamide based treatments for metals | William L. Harpel | 1997-06-24 |