Robert A. Bertelsen

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St. Louis Park, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Cross-flow filtration membrane test unit
- Patent number 4,846,970
- Issue date Jul 11, 1989
- Osmonics, Inc.
- Robert A. Bertelsen
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Tapered, spirally wound filter cartridge and method of making same
- Patent number 4,839,037
- Issue date Jun 13, 1989
- Osmonics, Inc.
- Robert A. Bertelsen
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL