Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873623 | Process control interface with simultaneously displayed three level dynamic menu | Lynn V. Lybeck, David S. Perloff, Shoji Kumagi | 1989-10-10 |
| 4843538 | Multi-level dynamic menu which suppresses display of items previously designated as non-selectable | Lynn V. Lybeck, David S. Perloff, Chester L. Mallory | 1989-06-27 |
| 4805089 | Process control interface system for managing measurement data | Lynn V. Lybeck, David S. Perloff, Chester L. Mallory | 1989-02-14 |