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Your search returned 286 patents.
( 380/51 in Current US Classification ) |
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| 1 2 3 |
| Patent ID | Title | Date Filed |
| 6169804 | Method for verifying the expected postage security device and its status
| November 21, 1996 |
| 6163361 | Digital camera including a printer for receiving a cartridge having security control circuitry
| April 23, 1999 |
| 6157919 | PC-based open metering system and method
| December 19, 1995 |
| 6151590 | Network open metering system
| December 19, 1995 |
| 6134328 | Secure user certification for electronic commerce employing value metering system
| August 13, 1998 |
| 6131161 | Marking a digitally encoded video and/or audio signal
| October 3, 1996 |
| 1 2 3 |
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