Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12070633 | Unitary respirator with molded thermoset elastomeric elements | Johannes Hoogenraad, David P. Knivsland | 2024-08-27 |
| 11701528 | Unitary respirator with molded thermoset elastomeric elements | Johannes Hoogenraad, David P. Knivsland | 2023-07-18 |
| D910396 | Attachment for a sanding device | — | 2021-02-16 |
| 10065056 | Unitary respirator with molded thermoset elastomeric elements | Johannes Hoogenraad, David P. Knivsland | 2018-09-04 |
| 8839788 | Respirator attachment component with molded thermoset elastomeric seal | James R. Betz, Sean M. Burke | 2014-09-23 |
| 8820326 | Respirator facepiece with thermoset elastomeric face seal | Johannes Hoogenraad, David P. Knivsland | 2014-09-02 |
| 7650884 | Respiratory facepiece and method of making a facepiece using separate molds | Steven J. Maxa | 2010-01-26 |