Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D924405 | Portable oxygen device | Richard P. Imbruce | 2021-07-06 |
| 10926113 | Portable chemical oxygen generator | Richard P. Imbruce | 2021-02-23 |
| 10556135 | Portable chemical oxygen generator | Richard P. Imbruce | 2020-02-11 |
| 10039942 | Portable chemical oxygen generator | Richard P. Imbruce | 2018-08-07 |
| 9849312 | Portable chemical oxygen generator | Richard P. Imbruce | 2017-12-26 |
| 7922420 | Barriers with kiss-offs | Marc E. Christensen, Greg H. Brown, Bryan D. Grabowski, Charles M. Mettler, Bruce E. Owens +1 more | 2011-04-12 |
| 7588387 | Barriers with interlocking sides | Marc E. Christensen, Greg H. Brown, Bryan D. Grabowski, Charles M. Mettler, Bruce E. Owens +1 more | 2009-09-15 |
| D533281 | Barrier with interlocking sides | Marc E. Christensen, Greg H. Brown, Bryan D. Grabowski, Charles M. Mettler, Bruce E. Owens +1 more | 2006-12-05 |
| 6769207 | Portable sign assembly | Gregory H. Brown, Charles M. Mettler | 2004-08-03 |
| 6182600 | Traffic channeling device | Gregory H. Brown, David A. Cowan | 2001-02-06 |
| D406543 | Traffic channelizer | Gregory H. Brown, David A. Cowan | 1999-03-09 |
| 5421668 | Tread ballast or weight for temporary traffic control devices and posts | David A. Cowan | 1995-06-06 |