Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10704221 | Lockable composite manhole cover system, apparatus and method | Erik V. Koch | 2020-07-07 |
| 9157212 | Corrosion-resistant self-locking manhole cover | Jeffrey R. Sullivan | 2015-10-13 |
| 9127431 | Manhole security cover | Thomas R. Lanham, Wayne A. Hemmerling, Andrew D. Trank, Daniel Corby, Jeffrey R. Sullivan | 2015-09-08 |
| 9115479 | Corrosion-resistant self-locking manhole cover | Jeffrey R. Sullivan | 2015-08-25 |
| 8888400 | Corrosion-resistant self-locking manhole cover | Jeffrey R. Sullivan | 2014-11-18 |
| 7896574 | Self-locking manhole cover | Jeffrey R. Sullivan | 2011-03-01 |
| 7798742 | Security key tool for manhole access opening security device | Jeffrey R. Sullivan | 2010-09-21 |
| 7704010 | Security device for manhole access opening | Jeffrey R. Sullivan | 2010-04-27 |
| 7377134 | Ringless meter lock | Jeffrey R. Sullivan | 2008-05-27 |
| 7021090 | Ringless meter lock | Jeffrey R. Sullivan | 2006-04-04 |
| 6976373 | Ringless meter lock | Jeffrey R. Sullivan | 2005-12-20 |
| 6742365 | Ringless meter lock | Jeffrey R. Sullivan | 2004-06-01 |