Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5686786 | Light bulb with glass envelope having light transmission of a wavelength only up to 700mm | William J. Lang, Ralph E. Johnson | 1997-11-11 |
| 5659222 | Vacuum sealed incandescent lamp with improved filament support structure | Charles Robert Ragsdale | 1997-08-19 |