Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839618 | Monolithic crystal filter with wide bandwidth and method of making same | Gerald E. Roberts, A. Gordon Staples | 1989-06-13 |
| 4833430 | Coupled-dual resonator crystal | Gerald E. Roberts, Robert J. Crescenzi | 1989-05-23 |