Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5472630 | Low phosphorous, low etch cleaner and method | Edward A. Rodzewich, William L. Harpel | 1995-12-05 |
| 5451270 | Composition for a method of monitoring dried-in-place non-chrome polyacrylamide based treatments for metals | William L. Harpel | 1995-09-19 |
| 5412011 | Composition and process for coating metals | Brenda S. Morris, David W. Reichgott | 1995-05-02 |
| 5401333 | Method of monitoring dried-in-place non-chrome polyacrylamide based treatments for aluminum | William L. Harpel | 1995-03-28 |
| 5344505 | Non-chromium passivation method and composition for galvanized metal surfaces | William L. Harpel | 1994-09-06 |
| 5292378 | Visible dried-in-place non-chrome treatment for aluminum | Bruce V. Haberle, Philip D. Deck, William L. Harpel | 1994-03-08 |