Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4601397 | Machine-retrievable card and card retrieval apparatus and method therefor | — | 1986-07-22 |
| RE32170 | Machine-retrievable card andcard retrieval apparatus and method therefor | — | 1986-06-03 |
| 4330063 | Machine-retrievable card and card retrieval apparatus and method therefor | — | 1982-05-18 |
| 4327834 | Document retrieval system | Robert Kalthoff | 1982-05-04 |
| 4308960 | Document retrieval system and components thereof | Robert Kalthoff | 1982-01-05 |