Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4914723 | Fluorescent lamp discharge tube having electrostatically coated envelope | Roger P. Ellerbeck, Leslie J. George, Peter J. Clewer | 1990-04-03 |
| 4446048 | Luminescent materials | David R. Palowkar | 1984-05-01 |
| 4396863 | Synthetic willemite phosphors and fluorescent lamp containing the same | David W. Smith | 1983-08-02 |