Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8984714 | Method and systems for acoustic cleaning | Ephraim Gutmark, Jeffrey Kastner, David Michael Chapin, James Knox Shelton | 2015-03-24 |
| 8404020 | Systems and methods for monitoring a rapping process | Vivek Venugopal Badami, Charles Erklin Seeley, David F. Johnston, Michael Mahler, Timothy Gerald Lawrence | 2013-03-26 |
| 8220420 | Device to improve effectiveness of pulse detonation cleaning | Robert Warren Taylor, David Michael Chapin, James Easel Roberts | 2012-07-17 |
| 8086424 | Method for determining life of filters in bag house | — | 2011-12-27 |
| 8000102 | Apparatus and arrangement for housing voltage conditioning and filtering circuitry components for an electrostatic precipitator | David F. Johnston, Easel Roberts, Dan Steinhaur | 2011-08-16 |
| 7837749 | System and method for monitoring impact machinery | Charles Erklin Seeley, Eladio Clemente Delgado, John Erik Hershey, Harold Woodruff Tomlinson, Jr., David F. Johnston | 2010-11-23 |
| 7562556 | Cleaning system and method for continuous emissions monitoring equipment | David F. Johnston, Jennifer Lynn Molaison, William Eberhardt, Mark Wayne Holt | 2009-07-21 |
| 7462220 | Methods and systems for detecting filter rupture | — | 2008-12-09 |
| 7452403 | System and method for applying partial discharge analysis for electrostatic precipitator | Abdelkrim Younsi, Yingneng Zhou, David F. Johnston, Robert Warren Taylor | 2008-11-18 |
| 6839251 | Apparatus and method for filtering voltage for an electrostatic precipitator | David F. Johnston, Michael Mahler, Robert Hummell | 2005-01-04 |
| 6628568 | System and method for verification of acoustic horn performance | Michael Mahler, David F. Johnston | 2003-09-30 |
| 6611440 | Apparatus and method for filtering voltage for an electrostatic precipitator | David F. Johnston, Michael Mahler, Robert Hummell | 2003-08-26 |
| 6540812 | Method and system for improved rapper control | David F. Johnston, Sven Richter, Michael Mahler | 2003-04-01 |
| 5068811 | Electrical control system for electrostatic precipitator | David F. Johnston | 1991-11-26 |