Dennis James Johnson
Engineers at Redleaf Ct, Windom, MN

7448144, Nov 11, 2008

Aug 31, 2005

11/216939

Matthew W. Johnson - Windom MN, US
Dennis J. Johnson - Windom MN, US

F26B 21/06

34 80, 34 79, 96152, 4352901

An apparatus for treating air from an exhaust port of a building. The apparatus includes an enclosed pathway having an inlet for communication with an exhaust port, a discharge outlet, and a non-linear pathway portion between the inlet and discharge outlet. The non-linear pathway includes air treatment material positioned in communication with a portion of the pathway to expose the air to the air treatment material as it moves through the pathway. The apparatus includes an irrigation system for maintaining the moisture content of the air treatment material.

6251269, Jun 26, 2001

Mar 18, 1999

9/271500

Dennis J. Johnson - Windom MN
Ronald P. Bloom - Miltona MN

B01D 2400

210170

A filtration system that is coupled to a fluid flow for creating a uniform horizontal fluid flow through the filtration system to remove impurities from the fluid flow. The filtration system includes a filter having an inlet region, an outlet region, and a filter housing fluidly coupled between the inlet region and the outlet region. The inlet region includes an inlet pipe and a mixing chamber for creating a uniform horizontal fluid flow through the filter. The filter housing includes a removable filter element that receives the uniform horizontal fluid flow and removes impurities from flow, and the outlet region discharges the flow from the filter. In one embodiment, the inlet pipe includes a planar discharge end that is angled with respect to the horizontal axis of the fluid, and the mixing chamber includes a closed end, which the fluid flow strikes as it exits the inlet pipe to create a uniform horizontal flow through the mixing chamber. Additional filters can be joined in-series to form a modular filtration system, with each individual filter including a filter element that removes a predetermined impurity from the fluid flow.

7491265, Feb 17, 2009

Jun 17, 2005

11/155669

Dennis J. Johnson - Windom MN, US
Matthew W. Johnson - Windom MN, US

B01D 53/02

96121, 96134, 553852, 55511, 119450

A cover member adapted to confine gaseous emissions from animal waste in a waste collection area having a base for contacting and floating on at least a portion of a surface of the animal waste and a cover with at least one surface extending from the base. The cover member can include a buoyant frame to define a generally pyramid shape. The cover includes a layer of geotextile material and can include organic filter material with the internal volume of the cover member. A plurality of cover members can be closely aligned to cover a substantial portion of the surface of the animal waste.

2013009, Apr 18, 2013

Nov 30, 2012

13/691115

Matthew W. JOHNSON - Lake Crystal MN, US
Dennis J. JOHNSON - Windom MN, US

C12M 1/107, C12P 3/00

435168, 4352901, 4352862

A manure mixture within an anaerobic digestion tank stratifies to form a liquid effluent layer and a sludge layer. Liquid effluent from the liquid effluent layer is withdrawn from the tank through a height adjustable valve. The height adjustable valve is adapted to automatically adjust the position of its intake end within the liquid effluent layer in response to the level of the sludge layer detected by a sludge meter located within the tank. Liquid effluent withdrawn from the tank is passed through a heat exchange system including at least one heat exchanger. Heat from the heat exchanger is transferred to the liquid effluent to produce heated liquid effluent. The heated liquid effluent is reintroduced back into the digestion tank such that the temperature of the manure mixture within the tank is maintained within a suitable temperature range for anaerobic digestion of the manure mixture. Additionally, the heated liquid effluent is sprayed in an upwards direction so as to effect mixing of the manure mixture within the tank.

2009030, Dec 10, 2009

Jun 6, 2008

12/134435

Matthew W. Johnson - Lake Crystal MN, US
Dennis J. Johnson - Windom MN, US

C12P 1/04, C12M 1/00, C12M 1/36

435170, 4352904, 4352862, 4352861, 4352865, 4352901

A manure mixture within an anaerobic digestion tank stratifies to form a liquid effluent layer and a sludge layer. Liquid effluent from the liquid effluent layer is withdrawn from the tank through a height adjustable valve. The height adjustable valve is adapted to automatically adjust the position of its intake end within the liquid effluent layer in response to the level of the sludge layer detected by a sludge meter located within the tank. Liquid effluent withdrawn from the tank is passed through a heat exchange system including at least one heat exchanger. Heat from the heat exchanger is transferred to the liquid effluent to produce heated liquid effluent. The heated liquid effluent is reintroduced back into the digestion tank such that the temperature of the manure mixture within the tank is maintained within a suitable temperature range for anaerobic digestion of the manure mixture. Additionally, the heated liquid effluent is sprayed in an upwards direction so as to effect mixing of the manure mixture within the tank.