Christopher Kay Thissen

US Patent:

45227144, Jun 11, 1985

Filed:

Nov 16, 1983

Appl. No.:

6/552264

Inventors:

Christopher P. Thissen - Austin MN

Assignee:

Walker Process Corporation - Aurora IL

International Classification:

C02F 306

US Classification:

210150

Abstract:

A waste water treatment apparatus with a tank through which waste water flows, a rotary biological contactor in the tank with an annular plastic media fixed on a buoyant drum or tubular shaft providing buoyancy to which maintains immersion to the topmost peripheral portion of the drum, mechanical bearings to stabilize the contactor in the water and a drive connected to rotate the contactor.

US Patent:

41152689, Sep 19, 1978

Filed:

May 16, 1977

Appl. No.:

5/796874

Inventors:

Christopher P. Thissen - Austin MN

International Classification:

C02C 102

US Classification:

210150

Abstract:

A rotor for biological treatment apparatus, a plurality of cylindrical shaped waste water treatment modules on the shaft in closely spaced end-to-end relation with each other, each module including a convolute of sheet plastic spirally wound in a plurality of turns separated by cup-shaped recesses or irregularities welded to the next adjacent turn in the convolute and defining flow channels extending endwise through the cylindrical module and circumferentially thereof between adjacent turns of the convolute.

US Patent:

40837467, Apr 11, 1978

Filed:

Dec 23, 1976

Appl. No.:

5/754094

Inventors:

Christopher P. Thissen - Austin MN

Assignee:

Geo. A. Hormel & Co. - Austin MN

International Classification:

B32B 3114
B32B 3120
B32B 3126

US Classification:

156499

Abstract:

A method and apparatus for making biological discs comprises the steps and means for welding the longitudinal edges of a pair of identical rectangular plastic sheets together to form a single large sheet. This single large sheet is conveyed to a heating and vacuum forming station where the sheet is heated and vacuum formed to have a plurality of convex cup-like projections formed in the surface thereof. The sheet is then moved to a cutting station where heating mechanisms form openings therein for accommodating an axle and a plurality of tie rods, and the sheet is cut in circular configuration by a cutting device shiftable on a radius of predetermined magnitude.

US Patent:

39974430, Dec 14, 1976

Filed:

Aug 21, 1975

Appl. No.:

5/606589

Inventors:

Christopher Thissen - Austin MN

Assignee:

Geo. A. Hormel & Co. - Austin MN

International Classification:

C02C 104

US Classification:

210150

Abstract:

An apparatus for the biological treatment of waste water comprises a tank having a plurality of overlapped revolvable, partially submerged, circular discs positioned in the tank. The waste water is caused to flow longitudinally through the tank and along the surfaces of the revolving disc, whereby the waste water will be continuously treated by the aerobic bacteria growing on the surfaces of the discs. The tank is preferably provided with a cover or housed in a building for covering those portions of the biological disc which project above the surface of the water.

US Patent:

42843960, Aug 18, 1981

Filed:

Jul 14, 1980

Appl. No.:

6/168731

Inventors:

Christopher P. Thissen - Austin MN
Jerry J. Ferwerda - Austin MN
Milford J. Tweet - Austin MN
Ronald D. Hatfield - Austin MN

Assignee:

Walker Process Corporation - Aurora IL

International Classification:

B29C 1704

US Classification:

4253421

Abstract:

Apparatus for vacuum molding a plurality of three dimensional geometrical shapes in a thermoplastic polymeric sheet having a molding plate, the surface of which has a plurality of three dimensional geometrical shapes, with said molding plate having an enclosing border, a molding face and a non-molding face; a gas orifice extending through the molding plate so that a gas can flow from one face of the molding plate to the other face; a mechanism to move the molding plate along a predetermined path; a mechanism to maintain a thermoplastic polymeric sheet, heated to a plastic condition, adjoining the moving molding plate molding face; a mechanism to releasably seal the heated polymeric sheet to and all around the molding plate border; a vacuum source to remove gas, from between the heated polymeric sheet and the molding face of the molding plate, through the gas orifice whereby exterior pressure can force the heated sheet against the molding face surface; and a mechanism for removing the molded sheet, after it cools to a non-plastic condition, from contact with the moving molding plate face.

US Patent:

45376786, Aug 27, 1985

Filed:

Oct 4, 1984

Appl. No.:

6/657507

Inventors:

Christopher P. Thissen - Austin MN

Assignee:

Walker Process Corporation - Aurora IL

International Classification:

C02F 308

US Classification:

210150

Abstract:

A rotary biological contactor for treating waste water comprising a center core or shaft and a plastic media on the shaft and arranged in a multiplicity of modules spaced from each other, each module including a multiplicity of turns of plastic sheet material with edges at the ends of the module, the turns of plastic sheet material having elongate undulations extending obliquely of the rotation axis and of the ends of the module, adjacent turns of the plastic sheet material having the undulations extending transversely of each other so that each elongate undulation traverses a multiplicity of undulations of the next adjacent turn, each undulation being welded to the undulations of the next adjacent turn at each place where the undulations touch each other, and the plastic sheet material also having circumferentially extending zones or bands traversing the undulations and extending transversely of the undulations, the bands being free of such undulating relationship, the several undulations and circumferential bands defining a multiplicity of flow channels extending in multi-oblique directions and circumferential directions for alternately filling and purging the air and water during each revolution of the module and shaft.

US Patent:

43199496, Mar 16, 1982

Filed:

Jul 14, 1980

Appl. No.:

6/168732

Inventors:

Christopher P. Thissen - Austin MN
Jerry J. Ferwerda - Austin MN
Milford J. Tweet - Austin MN
Ronald D. Hatfield - Austin MN

Assignee:

Walker Process Corporation - Aurora IL

International Classification:

B32B 3100

US Classification:

156446

Abstract:

A heat sealing machine for producing a drum of spirally wound layers of thermoplastic polymeric sheet material heat sealed together having a rotatable horizontal shaft for receiving thermoplastic polymeric sheet material spirally wound thereon by rotation of the shaft; a heater adapted to be positioned between and adjoining a first polymeric sheet layer being spirally wound on the shaft and a prior layer wound on the shaft; and a support, for the heater, displaceable with respect to the shaft axis so that the heater can remain radially adjacent a drum surface on which another spiral layer is to be heat sealingly attached. A portion of the heater can be readily formable into cylindrical shell segments of varying radii when positioned between the two polymeric sheet layers.