Issued Patents All Time
Showing 101–125 of 127 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6608742 | Voltage and current source selection system for use in the protection, automation and control of an electric power system | Jeffrey B. Roberts, Armando Guzman-Casillas, Joseph B. Mooney, Luther S. Anderson | 2003-08-19 |
| 6567256 | Dual protective relay for power systems | — | 2003-05-20 |
| 6011480 | Protection quality capability for protective relays used in an electric power system | Jeffrey B. Roberts | 2000-01-04 |
| 5805813 | System for visual monitoring of operational indicators in an electric power system | — | 1998-09-08 |
| 5793595 | Multi-application relay for power systems | Stanley E. Zocholl | 1998-08-11 |
| 5793750 | System of communicating output function status indications between two or more power system protective relays | Gary W. Scheer | 1998-08-11 |
| 5680324 | Communications processor for electric power substations | David C. Wood | 1997-10-21 |
| 5602707 | Detection of transformer high side fuse operations in a power transmission system | Jeffrey B. Roberts | 1997-02-11 |
| 5515227 | Fault identification system for use in protective relays for power transmission lines | Jeffrey B. Roberts | 1996-05-07 |
| 5479315 | Protective relay for power systems capable of being tested with low-level voltage and current signals | — | 1995-12-26 |
| 5477408 | System for detecting certain erroneous fault-indicating data in a protective relay for power systems | Timothy P. Tibbals | 1995-12-19 |
| 5436784 | Motor protection relay using thermal models | Stanley E. Zocholl | 1995-07-25 |
| 5367426 | Distance relay with load encroachment protection, for use with power transmission lines | — | 1994-11-22 |
| 5365396 | Negative sequence directional element for a relay useful in protecting power transmission lines | Jeffrey B. Roberts | 1994-11-15 |
| 5349490 | Negative sequence directional element for a relay useful in protecting power transmission lines | Jeffrey B. Roberts | 1994-09-20 |
| 5325061 | Computationally-efficient distance relay for power transmission lines | — | 1994-06-28 |
| 5317472 | Apparatus for insuring the security of output signals from protective relays used in electric power systems | — | 1994-05-31 |
| 5262679 | Polarizing potential transfer switch circuit for use with power transmission lines | Jeffrey B. Roberts, William D. Hawbaker | 1993-11-16 |
| 5208545 | Apparatus and method for eliminating phase skew in a multi-channel data acquisition system | — | 1993-05-04 |
| 5160926 | Display transducer apparatus | — | 1992-11-03 |
| 5140492 | Distance relay using a polarizing voltage | — | 1992-08-18 |
| 5115226 | Relay for detecting a current disturbance and asserting an output | — | 1992-05-19 |
| 5041737 | Programmable bus-tie relay having a plurality of selectable setting groups | Jeffrey B. Roberts | 1991-08-20 |
| 4998098 | Overvoltage detector to indicate voltage to a remote monitor | — | 1991-03-05 |
| 4996624 | Fault location method for radial transmission and distribution systems | — | 1991-02-26 |