Christianson; Darrell Wayne
Patent Applications and Registrations
Patent applications and USPTO patent grants for Christianson; Darrell Wayne.The latest application filed is for "modular underdrain systems".
- Christianson; Darrell Wayne - Boone IA
| Patent | Date |
|---|---|
| Multi-media clarification systems and methods Grant 11,247,918 - St. Germain , et al. February 15, 2 | 2022-02-15 |
| Combination biological contactor and self-backwashing filter systems Grant 11,130,693 - Dumbaugh , et al. September 28, 2 | 2021-09-28 |
| Modular Underdrain Systems App 20210188660 - Faaborg; Rand S ; et al. | 2021-06-24 |
| Multi-media Clarification Systems And Methods App 20210155506 - St. Germain; Darin Lynn ; et al. | 2021-05-27 |
| Modular underdrain systems Grant 10,941,050 - Faaborg , et al. March 9, 2 | 2021-03-09 |
| Multi-media clarification systems and methods Grant 10,913,667 - St. Germain , et al. February 9, 2 | 2021-02-09 |
| Modular Underdrain Systems App 20200290891 - Faaborg; Rand S ; et al. | 2020-09-17 |
| Multi-media Clarification Systems And Methods App 20190177181 - St. Germain; Darin Lynn ; et al. | 2019-06-13 |
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