Issued Patents All Time
Showing 1–25 of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D833570 | Device to lift a motion decoy | — | 2018-11-13 |
| 9228746 | Heating device having a secondary safety circuit for a fuel line and method of operating the same | Hyungsik Lee | 2016-01-05 |
| 8596225 | Anti-stacking pump assembly for a water heater and method of operating the same | — | 2013-12-03 |
| 8047164 | Removable heat exchanger for a gas fired water heater | — | 2011-11-01 |
| 7438023 | Heating device having a thermal cut-off circuit for a fuel line and method of operating the same | Hyungsik Lee | 2008-10-21 |
| 7354244 | Blower and method of conveying fluids | Michael R. Hasbargen, John O'Neill, Anthony J. Coloma, Kevin Field, Darrell Wayne Schuh +1 more | 2008-04-08 |
| 7277627 | Rooftop water heater | Kevin Field | 2007-10-02 |
| 6948454 | Airflow apparatus | Christopher P. Flanner, Kevin Field | 2005-09-27 |
| 6745724 | Water heater having flue damper with airflow apparatus | Christopher P. Flanner, Kevin Field | 2004-06-08 |
| 6679014 | Rooftop water heater | Marc W. Akkala, Kevin Field, Randy T. Meyer | 2004-01-20 |
| 6591788 | Rooftop water heater | Marc W. Akkala, Kevin Field, Randy T. Meyer | 2003-07-15 |
| 6557501 | Water heater having flue damper with airflow apparatus | — | 2003-05-06 |
| 6422179 | Water heater flue system | Marc W. Akkala, Kevin Field, Robert F. Poehlman | 2002-07-23 |
| 6286465 | Water heater flue system | Marc W. Akkala, Kevin Field, Robert F. Poehlman | 2001-09-11 |
| 6276887 | Method of forming board book signatures | — | 2001-08-21 |
| 6269780 | Water heater heat trap | — | 2001-08-07 |
| 6262401 | Gold-plated water heater element and method of making same | Ray O. Knoeppel | 2001-07-17 |
| 6205291 | Scale-inhibiting heating element and method of making same | Ray O. Knoeppel | 2001-03-20 |
| 6202935 | Combined potable water heater and hydronic heating system | Marc W. Akkala, Jill M. Szczech, Frank A. Mueller, Kevin Field, Ray O. Knoeppel +1 more | 2001-03-20 |
| 6036480 | Combustion burner for a water heater | David Kramer, Darryl L. Ruark, Gary J. Potter, Martin P. McCathern, Peter J. Phillip | 2000-03-14 |
| 5347956 | Water heater with integral mixing valve | — | 1994-09-20 |
| 4951614 | Water heater construction | Marc W. Akkala | 1990-08-28 |
| 4911108 | Water heater construction | Marc W. Akkala | 1990-03-27 |
| 4823865 | Turbulator construction for a heat exchanger | — | 1989-04-25 |
| 4817564 | Water heater construction | Marc W. Akkala | 1989-04-04 |