Frederick M. Riser

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Sandy, UT, US

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Patents Grantslast 30 patents

Information Patent Grant
Aerobic waste sludge digester-thickener orbital system and method
- Patent number 4,940,545
- Issue date Jul 10, 1990
- Baker Hughes, Inc.
- David DiGregorio
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Grant
Orbital wastewater treatment system with combined surface aerator a...
- Patent number 4,869,818
- Issue date Sep 26, 1989
- Baker International Corporation
- David DiGregorio
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE