Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860339 | Programmable telephone/dictation terminal and method of operating same | David B. Chamberlin, Jy-Hong Su, Emil F. Jachmann, Suzanne N. Grey | 1989-08-22 |
| 4817132 | Multi-line access module for telephone set | David B. Chamberlin, Ernest D. Hoffman | 1989-03-28 |
| 4800582 | Method and apparatus for creating and storing telephone directory listings | Steven M. Smith, Emil F. Jachmann | 1989-01-24 |