David W. Ziemann

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Coon Rapids, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Air filter comprising frame with bowed inner edge
- Patent number 10,921,020
- Issue date Feb 16, 2021
- 3M Innovative Properties Company
- Glen O. Gregerson
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
Framed Air Filter with Stabilizing Flap
- Publication number 20240207769
- Publication date Jun 27, 2024
- 3M Innovative Properties Company
- Fiona E. Menken
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
AIR FILTER COMPRISING FRAME WITH BOWED INNER EDGE
- Publication number 20190242616
- Publication date Aug 8, 2019
- 3M Innovative Properties Company
- Glen O. Gregerson
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL