David Systems, Inc.
7Patents
0Active
7Granted
28Portfolio score
Filing activity: May 7, 1984 → Dec 21, 1989
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4584690A | Alternate Mark Invert (AMI) transceiver with switchable detection and digital precompensation | Electricity | 122 | Expired |
| US4918688A | Method and apparatus for coupling computer work stations | Electricity | 101 | Expired |
| US4975903A | Digital timeslot and signaling bus in a digital PBX switch | Electricity | 27 | Expired |
| US4579406A | Printed circuit board connector system | Electricity | 26 | Expired |
| US4680779A | Distributed clock synchronization in a digital data switching system | Electricity | 22 | Expired |
| US4731827A | Interswitch line circuit | Electricity | 7 | Expired |
| US4689816A | Three relay C. O. trunk interface | Electricity | 5 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.