Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11611231 | Uninterruptible power supply system having stranded power recovery | Kevin B. Carney, Peter A. Panfil | 2023-03-21 |
| 11283289 | Uninterruptible power supply system having stranded power recovery | Kevin B. Carney, Peter A. Panfil | 2022-03-22 |
| 11183869 | System and method for generator frequency control during UPS power walk-in | Peter A. Panfil, Brian P. Heber | 2021-11-23 |
| 10439431 | Method to reduce inrush currents in a transformer-less rectifier uninterruptible power supply system | Charles F. Blair, Xian Chen | 2019-10-08 |
| 10404094 | System and method for power sharing in a multiple UPS system | Charles F. Blair, Gregg J. Nelson | 2019-09-03 |
| 10340733 | 3-wire transformer-free UPS system and method of control to reduce common mode current | Edwin Shires, Brian P. Heber, Charles F. Blair | 2019-07-02 |
| 10277066 | Method for balancing power in paralleled converters | Brian P. Heber | 2019-04-30 |
| 9915687 | Real current meter | James K. Martin, Charles F. Blair | 2018-03-13 |
| 9876390 | Techniques for improving operation of static transfer switches during voltage disturbances | Brian P. Heber, Russell E. Shetler, Jr., Peter A. Panfil | 2018-01-23 |
| 9531288 | Systems and methods for balancing UPS output voltages during transitions between operating modes | Brian P. Heber, Russell E. Shetler, Jr. | 2016-12-27 |
| 9520874 | Operating a static transfer switch to eliminate transformer inrush current in the presence of residual flux | James M. Miller | 2016-12-13 |
| 9268000 | System and method for improved accuracy in battery resistance measurement systems | Brian Scott Cogar, Russell E. Shetler, Jr., Charles O'Donnell | 2016-02-23 |
| 8271146 | Maximized battery run-time in a parallel UPS system | Brian P. Heber, Kevin Eschhofen, Mohammad Nanda Rahmana Marwali | 2012-09-18 |
| 7987023 | Humidity control for multiple unit A/C system installations | John E. Saunders, John F. Christensen | 2011-07-26 |
| 7668624 | Maximized battery run-time in a parallel UPS system | Brian P. Heber, Kevin Eschhofen, Mohammad Nanda Rahmana Marwali | 2010-02-23 |
| 7566988 | Method and apparatus for monitoring UPS power sources | Brian P. Heber, Mohammad Nanda Rahmana Marwali, Paul Taylor | 2009-07-28 |
| 7459804 | Static transfer switch device and method | Mohammad Nanda Rahmana Marwali | 2008-12-02 |
| 7352082 | Transfer switch device and method | Mohammad Nanda Rahmana Marwali, Brian P. Heber, Jeffery Earl Grant Powell | 2008-04-01 |
| 6917124 | Uninterruptible power supply | Russell E. Shetler, Jr., Brian P. Heber, Kevin Eschhofen, Ramesh Subramanian, Nelson John Norris +7 more | 2005-07-12 |
| RE31398 | Electronic audio signalling device for telephones | Dennis J. Denen | 1983-09-27 |
| 4214131 | Electronic audio signalling device for telephones | D. Joseph Denen | 1980-07-22 |