Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882474 | Security file system and method for securing data in a portable data carrier | Ewald C. Anderl, Oren Frankel | 1989-11-21 |
| 4816653 | Security file system for a portable data carrier | Ewald C. Anderl, Oren Frankel | 1989-03-28 |
| 4816654 | Improved security system for a portable data carrier | Ewald C. Anderl, Oren Frankel | 1989-03-28 |