David K. Lee
41Patents
22h-index
28Co-inventors
81Inventor score
Filing activity: Oct 12, 1988 → Mar 28, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5781438A | Token generation process in an open metering system | Physics | 338 | Expired |
| US5796841A | Secure user certification for electronic commerce employing value metering system | Electricity | 173 | Expired |
| US5742683A | System and method for managing multiple users with different privileges in an open metering system | Physics | 144 | Expired |
| US6466921B1 | Virtual postage meter with secure digital signature device | Physics | 112 | Expired |
| US5793867A | System and method for disaster recovery in an open metering system | Physics | 79 | Expired |
| US5625694A | Method of inhibiting token generation in an open metering system | Physics | 67 | Expired |
| US5812945A | Metered payment cellular telephone communication system | Electricity | 63 | Expired |
| US6061671A | System and method for disaster recovery in an open metering system | Physics | 58 | Expired |
| US6058193A | System and method of verifying cryptographic postage evidencing using a fixed key set | Physics | 56 | Expired |
| US5987441A | Token generation process in an open metering system | Physics | 54 | Expired |
| US6151590A | Network open metering system | Physics | 40 | Expired |
| US6098058A | Postage metering system and method for automatic detection of remote postage security devices on a network | Physics | 36 | Expired |
| US6430543B1 | Controlled acceptance mail fraud detection system | Physics | 36 | Expired |
| US6157919A | PC-based open metering system and method | Physics | 35 | Expired |
| US5499374A | Event driven communication network | Electricity | 35 | Expired |
| US5590198A | Open metering system with super password vault access | Physics | 33 | Expired |
| US5982896A | System and method of verifying cryptographic postage evidencing using a fixed key set | Physics | 33 | Expired |
| US5390351A | System for communicating with plural nodes in predetermined intervals depended on integers assigned and changed based upon configuration thereof | Performing Operations; Transporting | 32 | Expired |
| US5452419A | Serial communication control system between nodes having predetermined intervals for synchronous communications and mediating asynchronous communications for unused time in the predetermined intervals | Emerging Cross-Sectional Technologies | 25 | Expired |
| US6085181A | Postage metering system and method for a stand-alone meter operating as a meter server on a network | Physics | 24 | Expired |
| US6134328A | Secure user certification for electronic commerce employing value metering system | Electricity | 23 | Expired |
| US5168804A | Postage meter having an automatic slogan sub-module | Physics | 22 | Expired |
| US6865557B1 | Network open metering system | Physics | 21 | Expired |
| US4947317A | Communication protocol for a three nodes system having dedicated connections and bit indicating function of exchanged message | Electricity | 19 | Expired |
| US6285990A | Method for reissuing digital tokens in an open metering system | Physics | 19 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.