Tone Commanders Systems, Inc.
7Patents
0Active
7Granted
23Portfolio score
Filing activity: Aug 6, 1976 → Aug 28, 1979
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4188511A | Multi-link telephone intercom system | Electricity | 15 | Expired |
| US4258232A | Line hold circuits | Electricity | 11 | Expired |
| US4086441A | Message-waiting and do-not-disturb communications system | Electricity | 8 | Expired |
| US4292475A | Expandable link telephone intercom system | Electricity | 7 | Expired |
| US4158110A | Tone selective key telephone intercom system including digital tone detector | Electricity | 6 | Expired |
| US4086444A | Dial pulse key telephone intercom system | Electricity | 3 | Expired |
| USD245871S | Telephone communications module | General | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.