Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6464757 | Filter for chemical oxygen generators | Yunchang Zhang, Michael J. Brumely, James C. Cannon, Girish S. Kshirsagar | 2002-10-15 |
| 6296689 | Filter for chemical oxygen generators | Yunchang Zhang, Michael J. Brumely, James C. Cannon, Girish S. Kshirsagar | 2001-10-02 |
| 6071329 | Filter for chemical oxygen generators | Yunchang Zhang, Michael J. Brumely, James C. Cannon, Girish S. Kshirsagar | 2000-06-06 |
| 5048791 | Shut off valve | Mai Ujjin | 1991-09-17 |
| 4880205 | Hung diaphragm solenoid valve | — | 1989-11-14 |
| 4791960 | Semi-pilot operated four-way valve | — | 1988-12-20 |
| 4783044 | Hung diaphragm solenoid valve | — | 1988-11-08 |
| 4649360 | Solenoid valve with contractible assembly ring | Roger G. Riefler | 1987-03-10 |