John R Rindt from 1219 83Rd St, Grand Forks, ND 58201, age 73, Phone: (701)7950116

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Position:

President/Consultant at GeoDynamics, Inc.

Location:

Grand Forks, North Dakota Area

Industry:

Environmental Services

Work:

GeoDynamics, Inc. since Jan 1996
President/Consultant
Alion Science and Technology Mar 2005 - May 2009
Director Surface Engineering Center

Education:

The University of North Dakota 1976 - 1979
MSChE, Engineering

Saturation Vessel For Use In The Treatment Of Waste Water
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US Patent:

6877726, Apr 12, 2005
Filed:

Dec 13, 2002
Appl. No.:

10/319165
Inventors:

John R. Rindt - Grand Forks ND, US
Don V. Mathsen - Grand Forks ND, US
International Classification:

B01F003/04
US Classification:

261111, 261113, 2101981
Abstract:

A saturation vessel for treating waste water is provided with a hollow body member having a fluid inlet and outlet. A plurality of diffuser plates are positioned one above the other within the body member. A perforated screen member surrounds the diffuser plates. Waste water engages the diffuser plates and the screen to increase the saturation level of air within the waste water. The fluid outlet discharges the air-saturated water to a desired location. The level of waste water agitation is varied by changing the shape and configuration of the diffuser plates and screen member.

Nozzle Assembly For Use In The Treatment Of Waste Water
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US Patent:

6892968, May 17, 2005
Filed:

Dec 5, 2002
Appl. No.:

10/314393
Inventors:

John R. Rindt - Grand Forks ND, US
Don V. Mathsen - Grand Forks ND, US
International Classification:

B05B001/14
A62C002/08
US Classification:

2395535, 239548, 239552, 2395533, 239482, 239469
Abstract:

A nozzle for use in treating waste water is provided with a hollow body member having fluid inlets and outlets. A glide tube having a tapered interior is positioned within the body member. A boulet is positioned within the glide tube to form a pressure drop zone and an expansion zone between the glide tube and the boulet. The fluid inlet receives highly or super-saturated liquid from which micro bubbles of gas are produced within the pressure drop and expansion zones. The fluid outlet discharges the liquid and micro bubbles to a desired point of use.

On-Line Respirometer And Method Of Using The Same
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US Patent:

6905872, Jun 14, 2005
Filed:

Jun 14, 2002
Appl. No.:

10/172114
Inventors:

John R. Rindt - Grand Forks ND, US
International Classification:

C12M003/00
US Classification:

4352875, 4352866, 4352871
Abstract:

An on-line respirometer and method for using the same is disclosed for determining the oxygen uptake of respiring samples. An overflow drain in the side portion of an enclosed reaction vessel is located to define an operational volume of slurry sample and headspace gases. The slurry sample is agitated using a mixer and/or a pump which recirculates the headspace gases through the slurry. Oxygen probes inserted into the headspace and the slurry sample determine the level of dissolved oxygen within the slurry sample and the headspace. The fixed ratio of available oxygen to oxygen demand is sufficient to measure the oxygen uptake directly, without the need for oxygen supplementation, for simple, fast and accurate analysis.

Direct Coal Liquefaction Process
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US Patent:

52562786, Oct 26, 1993
Filed:

Feb 27, 1992
Appl. No.:

7/843909
Inventors:

John R. Rindt - Grand Forks ND
Melanie D. Hetland - Grand Forks ND
Assignee:

Energy and Environmental Research Center Foundation (EERC Foundation) - Grand Forks ND
International Classification:

C10G 100
C10G 106
US Classification:

208400
Abstract:

An improved multistep liquefaction process for organic carbonaceous mater which produces a virtually completely solvent-soluble carbonaceous liquid product. The solubilized product may be more amenable to further processing than liquid products produced by current methods. In the initial processing step, the finely divided organic carbonaceous material is treated with a hydrocarbonaceous pasting solvent containing from 10% and 100% by weight process-derived phenolic species at a temperature within the range of 300. degree. C. to 400. degree. C. for typically from 2 minutes to 120 minutes in the presence of a carbon monoxide reductant and an optional hydrogen sulfide reaction promoter in an amount ranging from 0 to 10% by weight of the moisture- and ash-free organic carbonaceous material fed to the system. As a result, hydrogen is generated via the water/gas shift reaction at a rate necessary to prevent condensation reactions. In a second step, the reaction product of the first step is hydrogenated.

Ionic Liquefaction Process
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US Patent:

48469637, Jul 11, 1989
Filed:

Apr 18, 1986
Appl. No.:

6/853703
Inventors:

Curtis L. Knudson - Grand Forks ND
John R. Rindt - Grand Forks ND
Sylvia A. Farnum - Grand Forks ND
International Classification:

C10G 100
C10G 106
US Classification:

208408
Abstract:

A coal liquefaction process using ionic liquefaction techniques with polar solvent solubilizing agents and water soluble inorganic compounds, produces a carbonaceous liquefaction product which is separated from the process stream by the use of methanol as a partitioning agent and the methanol and solubilizing agent are recovered separately for reuse.