Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10571394 | Control methods for setting a reference voltage in an air treatment system | Thomas Jay Leppien, Gregory K. Evans | 2020-02-25 |
| 9568210 | Control methods for setting a reference voltage in an air treatment system | Thomas Jay Leppien, Gregory K. Evans | 2017-02-14 |
| 8882378 | Heating and dispenser system | Richard B. Bylsma, Steve O. Mork, David W. Baarman, Jesse C. Leverett | 2014-11-11 |
| 8689603 | Control methods for setting a reference voltage in an air treatment system | Thomas Jay Leppien, Gregory K. Evans | 2014-04-08 |
| 8092575 | Control methods for tracking filter life in an air treatment system | Thomas Jay Leppien, Gregory K. Evans | 2012-01-10 |
| 8021469 | Control methods for an air treatment system | Thomas Jay Leppien, Gregory K. Evans | 2011-09-20 |
| 7888614 | Control panel assembly | Bradley J. Pippel, Terry L. Lautzenheiser | 2011-02-15 |
| 7629548 | Control panel assembly | Bradley J. Pippel, Terry L. Lautzenheiser | 2009-12-08 |
| D503972 | Air treatment system | Bradley J. Pippel, Rick G. Good, Matthew H. Hess, Gregory K. Evans | 2005-04-12 |
| D502757 | Water treatment system | Steve O. Mork, Rick G. Good, Karen J. VanderKooi | 2005-03-08 |
| 5925172 | Air treatment system | Bradley G. Rick | 1999-07-20 |
| 4918426 | Method and apparatus for sensing fluid flow volume to indicate end of filter life | Lawrence D. Butts | 1990-04-17 |
| 4393740 | Programmable tone generator | Carl Oppenheimer | 1983-07-19 |
| 4333377 | Tone generation system for electronic musical instrument | Carl Oppenheimer | 1982-06-08 |