Inter-Tel, Inc.
34Patents
7Active
34Granted
36Portfolio score
Filing activity: Oct 18, 1974 → Jun 13, 2006 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3955141A | Synchronizing circuit for modems in a data communications network | Electricity | 48 | Expired |
| US4306116A | Communications unit for voice and data | Electricity | 46 | Expired |
| USD479517S1 | Telephone | General | 37 | Expired |
| USD482342S1 | Telephone | General | 36 | Expired |
| US4076961A | Automatic switching unit for data communications network | Electricity | 31 | Expired |
| US4055808A | Data communications network testing system | Electricity | 28 | Expired |
| US7778399B2 | System and method for real-time call log status | Electricity | 25 | Active |
| US7398215B2 | Prompt language translation for a telecommunications system | Electricity | 24 | Active |
| US8103722B2 | Endpoint status notification system | Electricity | 19 | Active |
| USD470830S1 | Telephone | General | 18 | Expired |
| US6999431B2 | Voice over internet protocol | Electricity | 17 | Expired |
| US6798874B1 | System and method for enabling custom telephone features on a PBX system | Electricity | 16 | Expired |
| USD541264S1 | PBX communication system | General | 14 | Expired |
| US7526079B2 | System and method for data attachment in live call transfers | Electricity | 14 | Expired |
| US4055733A | Line level signal measuring device | Electricity | 13 | Expired |
| USD569865S1 | Voice over internet protocol device | General | 10 | Expired |
| US6829249B1 | Voice-over internet protocol | Electricity | 10 | Expired |
| US7031443B2 | System and method for remote access to a telephone | Electricity | 9 | Expired |
| US4037049A | Modulator and demodulator for data communications network | Electricity | 9 | Expired |
| US7995721B2 | System and method for remote access to a telephone | Electricity | 8 | Active |
| USD529892S1 | Hybrid voice communication system | General | 8 | Expired |
| USD499724S1 | Telephone handset | General | 7 | Expired |
| USD476969S1 | Telephone | General | 7 | Expired |
| USD489049S1 | Telephone | General | 4 | Expired |
| US7133465B2 | Modified Tomlinson-Harashima precoding method circuit for infinite impulse response (IIR) channels | Electricity | 3 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.