Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE31575 | Sulfur compounds and method of making same | Allen C. Ludwig, Henry F. Frazier | 1984-05-01 |
| 4406706 | Yellow colorant composition and paints utilizing the same | — | 1983-09-27 |
| 4290816 | Sulfur compounds and method of making same | Allen C. Ludwig, Henry F. Frazier | 1981-09-22 |