COM21, Inc.
🏢 View company profile →17Patents
0Active
17Granted
35Portfolio score
Filing activity: Sep 17, 1991 → Mar 25, 1999
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5954583A | Secure access control system | Physics | 290 | Expired |
| US6137793A | Reverse path multiplexer for use in high speed data transmissions | Electricity | 244 | Expired |
| US5917822A | Method for providing integrated packet services over a shared-media network | Electricity | 232 | Expired |
| US6081533A | Method and apparatus for an application interface module in a subscriber terminal unit | Electricity | 229 | Expired |
| US6028860A | Prioritized virtual connection transmissions in a packet to ATM cell cable network | Electricity | 195 | Expired |
| US5421030A | Communications system and method for bi-directional communications between an upstream control facility and downstream user terminals | Electricity | 182 | Expired |
| US5425027A | Wide area fiber and TV cable fast packet cell network | Emerging Cross-Sectional Technologies | 163 | Expired |
| US6563829B1 | Method for providing integrated packet services over a shared-media network | Electricity | 121 | Expired |
| US5544164A | Method and cell based wide area network alternative access telephone and data system | Emerging Cross-Sectional Technologies | 93 | Expired |
| US6094211A | TV and data cable system ingress noise blocker | Electricity | 93 | Expired |
| US6049693A | Upstream ingress noise blocking filter for cable television system | Electricity | 89 | Expired |
| US5870134A | CATV network and cable modem system having a wireless return path | Electricity | 81 | Expired |
| US6075972A | CATV network and cable modem system having a wireless return path | Electricity | 74 | Expired |
| US5550820A | Multiple protocol personal communications network system | Emerging Cross-Sectional Technologies | 64 | Expired |
| US5926479A | Multiple protocol personal communications network system | Electricity | 63 | Expired |
| US5870395A | Wide area fiber and tv cable fast packet cell network | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5642351A | Wide area fiber and TV cable fast packet cell network | Emerging Cross-Sectional Technologies | 5 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.