Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10190796 | Self-sealing circular cross-section sheet metal duct and method for manufacturing a sealed circular cross-section duct | Douglas G. Gudenburr | 2019-01-29 |
| 9074709 | Process for manufacturing sealed round metal ductwork | Douglas G. Gudenburr, Christopher A. Armstrong, Andrew J. Male | 2015-07-07 |
| 8973954 | Dual purpose dimple for HVAC circular ductwork | Alvin Coughenour, Duane Fetko | 2015-03-10 |
| 8505185 | Method of installing sealed circular ductwork | Douglas G. Gudenburr | 2013-08-13 |
| 8429803 | Dual purpose dimple for HVAC circular ductwork | Alvin Coughenour, Duane Fetko | 2013-04-30 |
| 8151430 | Method of installing a self locking sheet metal duct | Douglas G. Gudenburr | 2012-04-10 |
| 7992904 | Sealing mechanism for ductwork | Douglas G. Gudenburr, Christopher A. Armstrong, Andrew J. Male | 2011-08-09 |
| 7708034 | Self locking sheet metal duct with a sealant | Douglas G. Gudenburr | 2010-05-04 |
| 7478467 | Self locking sheet metal duct with a sealant and method for manufacturing the duct with a sealant and installing the duct with a sealant | Douglas G. Gudenburr | 2009-01-20 |
| 6505441 | Access door for ductwork | Alan Shuey | 2003-01-14 |