Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8564302 | Test instruments for pulse TDR, step TDR and transmission analysis | — | 2013-10-22 |
| 8237427 | Wideband high impedance bridging module | — | 2012-08-07 |
| 8232807 | Apparatus for detecting imbalances in a paired line | Robert G. Crick | 2012-07-31 |
| 6670837 | Time domain reflectometer with digitally generated variable width pulse output | — | 2003-12-30 |
| 6621562 | Time domain reflectometer with wideband dual balanced duplexer line coupling circuit | — | 2003-09-16 |
| 4965795 | D channel monitor | Steven R. Coffelt | 1990-10-23 |
| 4910729 | ISDN traffic generator adapter | Steven R. Coffelt | 1990-03-20 |
| 4707848 | Test set communication/interface system | George D. Fleitz, Steven R. Coffelt, James D. Eckman, Wayne Wong, Theodore E. Chavannes | 1987-11-17 |
| 4691336 | Telephone test set having an auxiliary amplifier and speaker for permitting listening to line signals | — | 1987-09-01 |
| 4682346 | Telephone test set | Richard W. Faith | 1987-07-21 |