Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5666406 | Hazard prevention for telephone line interface circuits | Brian A. F. S. Sutherland, Paul Fong-Yan Hung | 1997-09-09 |
| 5661794 | Telephone line interface circuit with voltage control | Reinhard W. Rosch | 1997-08-26 |
| 5511118 | Method of providing d.c. feed to a telephone line | Stanley Adam Gores, Joseph F. M. Darveau, Francois Tremblay, Reinhard W. Rosch | 1996-04-23 |
| 5390231 | Protection and recovery of telephone line interface circuits | Paul Fong-Yan Hung, Joseph F. M. Darveau, Reinhard W. Rosch, Brian A. F. S. Sutherland, Francois Tremblay | 1995-02-14 |
| 5323461 | Telephone line interface circuit with voltage switching | Brian A. F. S. Sutherland, Reinhard W. Rosch | 1994-06-21 |
| 5274702 | Wideband telephone line interface circuit | Reinhard W. Rosch | 1993-12-28 |
| 5103387 | High voltage converter | Donald S. McGinn, Brian A. F. S. Sutherland | 1992-04-07 |
| 4947427 | Protection arrangement for a telephone subscriber line interface circuit | Reinhard W. Rosch | 1990-08-07 |
| 4764956 | Active impedance line feed circuit | Reinhard W. Rosch, Calvin Plett, Zdenek Holy | 1988-08-16 |
| 4713838 | Amplifier with double rail output | Calvin Plett | 1987-12-15 |
| 4691271 | Voltage multiplier and voltage multipliers in an amplifier with double rail output | Calvin Plett | 1987-09-01 |
| 4571460 | Active impedance line feed circuit with improved ground fault protection | Calvin Plett | 1986-02-18 |
| 4539438 | Active impedance transformer assisted line feed circuit with supervision filtering | Zdenek Holy | 1985-09-03 |
| 4532381 | Active impedance line feed circuit | Zdenek Holy | 1985-07-30 |
| 4532384 | Line feed circuit including negative impedance circuit | Magdy H. Keriakos | 1985-07-30 |
| 4514595 | Active impedance line feed circuit | Martin R. Handforth | 1985-04-30 |
| 4484032 | Active impedance transformer assisted line feed circuit | — | 1984-11-20 |