Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6587843 | Method for improving the security of postage meter machines in the transfer of credit | George G. Gelfer, Wolfgang Thiel, Andreas Wagner | 2003-07-01 |
| 5805711 | Method of improving the security of postage meter machines | Harald Windel, Frank Reisinger, Claus Freytag, Ralf Kubatzki, Marcus Hansel +5 more | 1998-09-08 |
| 5729460 | Method for payment of the recrediting of an electronic postage meter and arrangement for the operation of a data central | Margaret Plett, George G. Gelfer, Jakob Zimmermann | 1998-03-17 |
| 5671146 | Method for improving the security of postage meter machines | Harald Windel, Frank Reisinger, Claus Freytag, Ralf Kubatzki, Andreas Wagner +3 more | 1997-09-23 |