Issued Patents All Time
Showing 26–50 of 76 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7533942 | Mine refuge | John M. Kennedy | 2009-05-19 |
| 7438506 | Jack for carrying and installing mine panels | John M. Kennedy | 2008-10-21 |
| 7393025 | Mine door system with trigger-actuated latch mechanism | John M. Kennedy | 2008-07-01 |
| 7267505 | Mine ventilation panel system | John M. Kennedy | 2007-09-11 |
| 7232368 | Mine ventilation | John M. Kennedy | 2007-06-19 |
| 7182687 | Air deflecting mine ventilation structure | John M. Kennedy | 2007-02-27 |
| 7118472 | Control system for pneumatically-powered door installation | John M. Kennedy | 2006-10-10 |
| 6955594 | Mine door system including an air pressure relief door | John M. Kennedy | 2005-10-18 |
| 6938372 | Pneumatically-powered mine door installation with hydraulic checking system | John M. Kennedy | 2005-09-06 |
| 6846132 | Mine stopping and braces therefor | John M. Kennedy | 2005-01-25 |
| 6715961 | Method of supporting mine walls and installing a mine stopping | John M. Kennedy | 2004-04-06 |
| 6688813 | Mine stopping and method of installing same | John M. Kennedy | 2004-02-10 |
| 6682263 | Multiple tier stopping and method of constructing stopping | John M. Kennedy | 2004-01-27 |
| 6669551 | Mine ventilation structure and deck panels therefor | John M. Kennedy | 2003-12-30 |
| 6594954 | Mine door installation | John M. Kennedy | 2003-07-22 |
| 6457906 | Mine stopping | John M. Kennedy | 2002-10-01 |
| 6425820 | Mine door power drive system | John M. Kennedy | 2002-07-30 |
| 6419324 | Method of sealing off a mine passageway | John M. Kennedy | 2002-07-16 |
| 6394707 | Yieldable mine roof support | John M. Kennedy | 2002-05-28 |
| 6379084 | Mine stopping | John M. Kennedy | 2002-04-30 |
| 6264549 | Mine ventilation | John M. Kennedy | 2001-07-24 |
| 6256946 | Adjustable stairway for use with an overcast in a mine | John M. Kennedy | 2001-07-10 |
| 6220785 | Mine stopping, method of constructing same and panels thereof | John M. Kennedy | 2001-04-24 |
| 6164871 | Mine stopping having a swinging door | John M. Kennedy | 2000-12-26 |
| RE36853 | Mine door system | John M. Kennedy | 2000-09-05 |