John N. Evers

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Fridley, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Rotary shutter
- Patent number 5,539,488
- Issue date Jul 23, 1996
- Lucht, Inc.
- Paul Erickson
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Apparatus and method for monitoring a water treatment system
- Patent number 5,058,032
- Issue date Oct 15, 1991
- Autotrol Corporation
- Michael D. Farrell
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE