Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6551015 | Method of and system for venting out buildup of explosive gases in a manhole | Mohammed Khajavi | 2003-04-22 |
| 6350081 | Manhole restraining system for venting out explosive gases in a manhole | Mohammed Khajavi | 2002-02-26 |