Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862516 | System for automatically tuning the antenna of a miniature portable communications device | James S. Irwin, Walter L. Davis | 1989-08-29 |
| 4817196 | Apparatus for tuning the antenna of a miniature personal communications device | James S. Irwin | 1989-03-28 |
| 4804954 | Battery saving method for portable communications receivers | David F. Williard | 1989-02-14 |
| 4803487 | Portable communications receiver with separate information presentation means | David F. Willard | 1989-02-07 |