Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845632 | Electonic postage meter system having arrangement for rapid storage of critical postage accounting data in plural nonvolatile memories | Sung S. Chang | 1989-07-04 |
| 4829469 | Security system for use with electronic postage meter to prevent lock erasure of data | Thomas Germaine | 1989-05-09 |
| 4817004 | Electronic postage meter operating system | Sung S. Chang | 1989-03-28 |
| 4805109 | Nonvolatile memory protection arrangement for electronic postage meter system having plural nonvolatile memories | Sung S. Chang | 1989-02-14 |