Issued Patents All Time
Showing 25 most recent of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8072715 | Method, apparatus and computer program product for fault protection | Louis V. Dusang, Jr. | 2011-12-06 |
| 7582986 | Compensated inverse-time undervoltage load shedding systems | Ralph W. Folkers, Edmund O. Schweitzer, III, Armando Guzman-Casillas, Gabriel Benmouyal | 2009-09-01 |
| 7453674 | Method for protecting an electric generator | Barry W. Kuehnle, Ralph W. Folkers | 2008-11-18 |
| 6839210 | Bus total overcurrent system for a protective relay | David E. Whitehead | 2005-01-04 |
| 6785105 | Ground fault detection system for ungrounded power systems | David E. Whitehead | 2004-08-31 |
| 6721671 | Directional element to determine faults on ungrounded power systems | — | 2004-04-13 |
| 6608742 | Voltage and current source selection system for use in the protection, automation and control of an electric power system | Edmund O. Schweitzer, III, Armando Guzman-Casillas, Joseph B. Mooney, Luther S. Anderson | 2003-08-19 |
| 6590397 | Line differential protection system for a power transmission line | — | 2003-07-08 |
| 6573726 | Sensitive ground fault detection system for use in compensated electric power distribution networks | Daqing Hou, Hector Altuve-Ferrer | 2003-06-03 |
| 6560132 | System for obtaining phase-ground voltages from a broken delta VT voltage connection system | — | 2003-05-06 |
| 6525543 | Fault type selection system for identifying faults in an electric power system | Demetrios Tziouvaras | 2003-02-25 |
| 6518767 | Line differential protection system for a power transmission line | Gabriel Benmouyal, Hector Altuve-Ferrer, Ralph W. Folkers, Demetrios Tziouvaras | 2003-02-11 |
| 6417791 | Delta filter with an adaptive time window for protective relays | Gabriel Benmouyal | 2002-07-09 |
| 6256592 | Multi-ended fault location system | Gabriel Benmouyal, Demetrios Tziouvaras | 2001-07-03 |
| 6101075 | System for improving protective relay coordination with other protective elements in power system | — | 2000-08-08 |
| 6084755 | Protective relay-based monitoring system of DC power within an electric power substation | Tony J. Lee, David E. Whitehead | 2000-07-04 |
| 6028754 | System for preventing undesired protective relay tripping actions due to coupling capacitor voltage transformer transients | Armando Guzman-Casillas | 2000-02-22 |
| 6011480 | Protection quality capability for protective relays used in an electric power system | Edmund O. Schweitzer, III | 2000-01-04 |
| 5883578 | Loss of potential determination for use in protective relays for electric power systems | Daging Hou | 1999-03-16 |
| D402031 | Electrosurgical pencil with rocker arm actuator | Gerald L. Pauley | 1998-12-01 |
| D402030 | Electrosurgical pencil with push button actuators | Gerald L. Pauley | 1998-12-01 |
| 5808845 | System for preventing sympathetic tripping in a power system | — | 1998-09-15 |
| 5790418 | Adaptive polarizing memory voltage time constant | Daqing Hou | 1998-08-04 |
| 5731943 | Protective relay having out-of-step logic capability | Daqing Hou, Armando Guzman-Casillas | 1998-03-24 |
| 5703745 | System for detection of transients from a coupling capacitor voltage transformer used in a protective relay | Daqing Hou | 1997-12-30 |