Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12070634 | Exhalation valve and respirator including same | Philip D. Eitzman | 2024-08-27 |
| 11033763 | Respirator including polymeric netting and method of forming same | Nhat Ha T. Nguyen, Seyed A. Angadjivand, Ronald W. Ausen, William J. Kopecky, Mark T. Gibson +2 more | 2021-06-15 |
| D900306 | Valve cover | Philip D. Eitzman | 2020-10-27 |
| 10653901 | Respirator having elastic straps having openwork structure | Nhat Ha T. Nguyen, Ronald W. Ausen, Seyed A. Angadjivand | 2020-05-19 |
| D882758 | Valve cover | Philip D. Eitzman | 2020-04-28 |
| D849245 | Valve cover | Philip D. Eitzman | 2019-05-21 |
| D843562 | Valve cover with diamond pattern | Philip D. Eitzman | 2019-03-19 |
| D842983 | Valve cover | Philip D. Eitzman | 2019-03-12 |
| D828546 | Valve cover with openings | Philip D. Eitzman | 2018-09-11 |
| D827812 | Valve cover with openings | Philip D. Eitzman | 2018-09-04 |
| D827811 | Valve cover | Philip D. Eitzman | 2018-09-04 |
| D676527 | Unidirectional valve | Michael K. Domroese, Philip G. Martin, David M. Blomberg, Nathan A. Abel | 2013-02-19 |
| 8365771 | Unidirectional valves and filtering face masks comprising unidirectional valves | Michael K. Domroese, Philip G. Martin, Nathan A. Abel | 2013-02-05 |
| 8171933 | Respirator having preloaded nose clip | Yonas Gebrewold | 2012-05-08 |