Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4791377 | Direct frequency synthesizer | John E. Grandfield, James T. Campbell, Carl H. Gundel | 1988-12-13 |
| 4757287 | Voltage tunable half wavelength microstrip filter | John E. Grandfield | 1988-07-12 |