Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8292991 | Gas mask filter canister | David K. Friday, John Schlaechter, Wayne Ballantyne, Robert J. Puhala | 2012-10-23 |
| 7311764 | Gas mask filter canister | David K. Friday, John Schlaechter, Wayne Ballantyne, Robert J. Puhala | 2007-12-25 |
| 7213595 | Multi-stage respirator filter with TIM filter option | Andrew Capon, David K. Friday | 2007-05-08 |
| 6860267 | Self-sealing filter connection and gas mask filter assembly incorporating the same | Andrew Capon, David K. Friday, Brian E. Davis, Gary M. Dunn | 2005-03-01 |
| 5062874 | Filter sealing apparatus | Pierre Legare | 1991-11-05 |