Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5300637 | 2-benzothiazolyl tetrazolium salt indicators | Robert P. Hatch, Nan-Horng Lin | 1994-04-05 |
| 5126275 | Analytical method using tetrazolium salt indicators having a reflectance plateau | Robert P. Hatch, Jürgen Köcher, Nan-Horng Lin, Klaus Wehling | 1992-06-30 |