Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4546448 | Programmable calculator including program variable initialization means and definition means array | Richard M. Spangler, Eugene V. Burmeister, Frank E. Cada, Chris J. Christopher, Wayne F. Covington +3 more | 1985-10-08 |
| 4366553 | Electronic computing apparatus employing basic language | Richard M. Spangler, Eugene V. Burmeister, Frank E. Cada, Wayne F. Covington, Chris J. Christopher +3 more | 1982-12-28 |
| 4322816 | Programmable calculator having structure for controlling an x-y plotter | Richard M. Spangler, Eugene V. Burmeister, Frank E. Cada, Wayne F. Covington, Chris J. Christopher +3 more | 1982-03-30 |
| 4181966 | Adaptable programmed calculator including a percent keyboard operator | Donald E. Morris, Jindrich Kohoutek, David S. Maitland, Douglas M. Clifford, Louis T. Schulte +1 more | 1980-01-01 |