Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11821487 | Vibration mitigation device | Richard E. Christenson, Darren E. Ingram | 2023-11-21 |
| 11585399 | Method and apparatus of providing energy absorption for vibration dampening in one or more planes | — | 2023-02-21 |
| 11181165 | Vibration mitigation device | Richard E. Christenson, Darren E. Ingram | 2021-11-23 |
| 10900532 | Method and apparatus of providing energy absorption for vibration dampening in a horizontal plane | Richard E. Christenson | 2021-01-26 |
| 10036446 | Vibration mitigation device | Richard E. Christenson, Darren E. Ingram | 2018-07-31 |
| 9593828 | Method and apparatus for damping vibration of poles | Richard E. Christenson | 2017-03-14 |
| 9470288 | Vibration mitigation device | Richard E. Christenson, Darren E. Ingram | 2016-10-18 |
| 8516752 | Support pole having a track | — | 2013-08-27 |
| 7621077 | Hinged pole apparatus | Mark Perina | 2009-11-24 |
| 6833505 | Handhole cover | — | 2004-12-21 |
| 6820389 | Support pole having a traffic signal support arm attached thereto | — | 2004-11-23 |
| 5481846 | Support pole having a bell-shaped lower end | — | 1996-01-09 |