US1933346A - Storage tank and mixing machine - Google Patents

Storage tank and mixing machine Download PDF

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Publication number
US1933346A
US1933346A US623551A US62355132A US1933346A US 1933346 A US1933346 A US 1933346A US 623551 A US623551 A US 623551A US 62355132 A US62355132 A US 62355132A US 1933346 A US1933346 A US 1933346A
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Prior art keywords
tube
tank
paint
wall
valve
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US623551A
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Fred F Schwentker
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General Electric Co
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General Electric Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/753—Discharging at the upper side of the receptacle, e.g. by pressurising the liquid in the receptacle or by centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/52—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle with a rotary stirrer in the recirculation tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/54—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle provided with a pump inside the receptacle to recirculate the material within the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/86—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle
    • B01F27/861—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis co-operating with deflectors or baffles fixed to the receptacle the baffles being of cylindrical shape, e.g. a mixing chamber surrounding the stirrer, the baffle being displaced axially to form an interior mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/92—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws
    • B01F27/921—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle
    • B01F27/9211—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws with helices centrally mounted in the receptacle the helices being surrounded by a guiding tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/752—Discharge mechanisms with arrangements for converting the mechanism from mixing to discharging, e.g. by either guiding a mixture back into a receptacle or discharging it
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/30—Mixing paints or paint ingredients, e.g. pigments, dyes, colours, lacquers or enamel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
    • B01F27/1144—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections with a plurality of blades following a helical path on a shaft or a blade support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/15—Stirrers with tubes for guiding the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements

Definitions

  • the present invention relates to combined storage tanks and mixing machines. It is especially well adapted for use as a storage tank and mixing machine for paint and in the following specification and in thedrawing, I have specifically described. and illustrated this application of my invention. It is to be understood, however, that this is only by way of example and that the invention is not limited thereto necessarily.
  • the object of the invention is to provide an improved construction and arrangement in a machine of this type which will effect rapid mixing and from which a well mixed portion will be drawn off when the mixed material is to be used.
  • Fig. 1 is a vertical sectional view of a storage tank and mixing machine embodying the invention
  • Fig. 2 is a detail sectional View through the discharge valve
  • Fig. 3 is a top plan View
  • Fig. 4 is a sectional view of one of the impellers
  • Fig. 5 is a sectional view taken on the line 55, Fig. 1.
  • 1 indicates the side walls of the storage tank which may be rectangular in cross section
  • 2 indicates the top wall
  • 3 indicates the bottom wall.
  • the top wall 2 is provided with aiilling opening closed by a removable cover 4.
  • the bottom wall 3 is dish V shaped, providing a centrally located low portion 5 to which the adjacent slopingwalls direct the flow of paint or othermaterial to be mixed.
  • impeller tube or mixing tube 6 Located in the tank is an impeller tube or mixing tube 6 supported from cover 2 by a plurality of straps 7. Straps 7 may be suitably Welded to tube 6 and fastened to the cover by screws 8. Tube 6 is supported in spaced relation to central portion 5 so as to leave a space 9 at the bottom of tube 6 through which may terial may flow into the tube.
  • impeller shaft 10 Inside tube 6 is an impeller shaft 10 on which is mounted a plurality of impellers 11, two being shown in the present instance. One impeller is located at the lower end of tube 6 and the other is located about centrally thereof.
  • bafilers 12 On each side of impellers 11 are suitable bafilers 12 which may be fastened to tube 6 by set screws such as are indicated at 13.
  • Each baiiler comprises an outer wall 14 connected by spokes 15 and a central hub 16. The lower end of shaft 10 makes a nice fit with the lowermost hub 16 which forms a bearing for the lower end of the shaft.
  • each impeller comprises a hub 16 on which is mounted a spirally extending disk 17. Hub 16 is fastened to shaft 10 by a set screw or other suitablemeans.
  • shaft 10 The, upper end of shaft 10 is'connected'to the shaft of an electric motor 18 which is vertically mounted in a casing 19 supported on tank top 2.
  • a step bearing on which shaft-10 is hung Fastened to straps 7 is a disk 21 .1ocated in spaced relation to the upper end of tube 6 and serving as a bafiler for directing outwardly fluid flowing from the, top of tube 6.
  • Fastened to shaft 10 above disk 21 is a disk 22 which func-. tions as a bearing guard for step bearing 20.
  • a discharge pipe 23 Connected to tube 6, adjacent to its upper'end and above the normal maximum liquid leveljin the tank, is a discharge pipe 23, which at its outer end is connected to a discharge valve or faucet 24. Faucet 24 is provided with a flange 25 which is suitably attached to the side wall 1 8.0
  • the faucet has a discharge port 26 and a passage 2'? which connects with a pipe 28 leading back into the tank.
  • Attached to faucet 24 is a suitable hand valve for closing and opening port 26. In the present instance, it is shown as comprising a shoe 29 carried by a yoke 30 pivoted on the casing of faucet 24. Attached to the yoke is a handle 31 for moving the valve. 32 and 33 are stops for limiting the movement of the valve, stop 33 being made adjustable 9 so that the opening movement may be adjustably controlled.
  • Shoe 29 is pressed into engagement with the end wall of the valve casing by a spring 34 located in a recess inhandle 31, the spring pressing against a spacing block 35 which in turn engages'the adjacent wall of shoe 29.
  • Shoe 29 is provided with a flange 36 which slides on the yoke to form a guide and support ing means for the shoe.
  • Spring '34 serves to press the shoe tightly against the end of valve casing and hold it in such position. In Fig. 1 the valve is shown closed and in Fig. 2 it is shown open.
  • an inverted cone shaped deflecting wall 37 supported by 19 ears 33 attached to side walls 1 adjacent to their lower ends, it being provided with a central opening through which tube 6 extends.
  • Tube 6 serves to hold the edges of wall 37 in spaced relation to side walls 1 providing thereby a marginal passage 40 through which paint flows to bottom wall 3.
  • paint in a mixed or partially mixed state or ingredients in suitable proportions to form paint are introduced through the opening in top wall 2, dotted line A indicating the maximum height to which the tank is to be filled.
  • Motor 18 is then started, rotating impellers 11 in a direction to effect an upward flow of paint through tube 6.
  • the paint is I caused to flow rapidly up through tube 6 to its upper end where it is discharged partly over the end of the tube beneath disk 21 and partly through pipe 23, casing of valve 24 and pipe 28.
  • the paint is circulated continuously, flowing down Wall 3'7 to wall 3 and then down wall 3 to the lower end of tube 6. This circulation and the beating action of the impellers effects rapid and complete mixing of the ingredients.
  • opening valve 24 When it is desired to utilize some of the paint, it is drawn olf by opening valve 24, the valve being opened partially or entirely as found desirable.
  • motor 18 is shut down, it being run only when it is desired to draw some paint from. the tank.
  • a rapid circulation and mixing of the contents of the tank is effected by the 1% i.- pellers. Only a small amount of the total paint being circulated is drawn oil? when the valve is opened. This means that when paint is being drawn from the tank, it is thoroughly mixed as it is drawn oil.
  • a relatively large stream of paint is put into circulation while a relatively small portion of such stream is discharged through valve port 26. This means that always a uniform mixture will be discharged through the valve. In.
  • the paint is stored in a tank from which it may be drawn readily. No hand mixing of the paint is necessary, a thing which saves considerable time, and always a uniform product is discharged through the faucet.
  • the device is simple in structure, clean and efficient in operation, prevents waste of and is capable of being manufactured at low cost.
  • a mixing machine the combination of a tube in the tank in spaced relation to the walls of the tank at each end, the upper end of the tube terminating above the normal liquid ivel in the tank, means'ior effecting ci sulaticn or materials to be mixed upwardly through the tube, the material being discharged over the upper end of the tube, a branch conduit to the tube below its upper end, but above the normal liquid level, said branch conduit extending from'the' tube through the wall of the tanlr for discharging liquid outside the tank, a pipe connecting the outer end of the branch conduit to the interior of the tank, and a valve in said branch conduit.
  • a mixing machine the combination of a tank, a tube in the tank in spaced relation to the walls of the tank at each end, the upper end of the tube terminating abovethe normal liquid level in the tank, means for efiecting circulation of materials to be mixed upwardly through the tube,the' material being discharged over the upper end of the tube, a branch oonduit connected to the tube below its upper end, but above the normal liquid level, said branch conduit extending from the tube through the wall of the tank for discharging liquid outside the tanir, a'valve in said branch conduit, and a deflecting wall surrounding the lower end of the tube.

Description

,1933. F. F. SCHWENTKER 1,933,346
STORAGE TANK AND MIXING MACHINE Filed July 20, 1932 Inventor Fred F SchwentkeT,
b His Attorne g,
Patented Oct. 31, 1933 FFIQE r STORAGE TANK AND MIXING MACHINE Fred F. Schwentker, Philadelphia, Pa, assignor to General Electric Company, a corporation of New York Ap lication July 20, 1932. Serial No. 623,551
'3 Claims.
The present invention relates to combined storage tanks and mixing machines. It is especially well adapted for use as a storage tank and mixing machine for paint and in the following specification and in thedrawing, I have specifically described. and illustrated this application of my invention. It is to be understood, however, that this is only by way of example and that the invention is not limited thereto necessarily.
The object of the invention is to provide an improved construction and arrangement in a machine of this type which will effect rapid mixing and from which a well mixed portion will be drawn off when the mixed material is to be used.
For a consideration of what I believe to be novel and my invention, attention is directed to the following specification and the claims appended thereto.
In the drawing, Fig. 1 is a vertical sectional view of a storage tank and mixing machine embodying the invention; Fig. 2 is a detail sectional View through the discharge valve; Fig. 3 is a top plan View and Fig. 4 is a sectional view of one of the impellers; Fig. 5 is a sectional view taken on the line 55, Fig. 1.
Referring to the drawing, 1 indicates the side walls of the storage tank which may be rectangular in cross section, 2 indicates the top wall and 3 indicates the bottom wall. The top wall 2 is provided with aiilling opening closed by a removable cover 4. The bottom wall 3 is dish V shaped, providing a centrally located low portion 5 to which the adjacent slopingwalls direct the flow of paint or othermaterial to be mixed.
Located in the tank is an impeller tube or mixing tube 6 supported from cover 2 by a plurality of straps 7. Straps 7 may be suitably Welded to tube 6 and fastened to the cover by screws 8. Tube 6 is supported in spaced relation to central portion 5 so as to leave a space 9 at the bottom of tube 6 through which may terial may flow into the tube. Inside tube 6 is an impeller shaft 10 on which is mounted a plurality of impellers 11, two being shown in the present instance. One impeller is located at the lower end of tube 6 and the other is located about centrally thereof. On each side of impellers 11 are suitable bafilers 12 which may be fastened to tube 6 by set screws such as are indicated at 13. Each baiiler comprises an outer wall 14 connected by spokes 15 and a central hub 16. The lower end of shaft 10 makes a nice fit with the lowermost hub 16 which forms a bearing for the lower end of the shaft. The
shaft passes loosely through the hubs of the other baiilers. I-lub 16 of the lowermost bafiler is supported on bottom wall 3, beingsuitably fastened thereto. Bythis arrangement, it forms also a rigid support for the lower end of tube 6. Each impeller comprises a hub 16 on which is mounted a spirally extending disk 17. Hub 16 is fastened to shaft 10 by a set screw or other suitablemeans.
The, upper end of shaft 10 is'connected'to the shaft of an electric motor 18 which is vertically mounted in a casing 19 supported on tank top 2. At 26 is a step bearing on which shaft-10 is hung; Fastened to straps 7 is a disk 21 .1ocated in spaced relation to the upper end of tube 6 and serving as a bafiler for directing outwardly fluid flowing from the, top of tube 6. Fastened to shaft 10 above disk 21 is a disk 22 which func-. tions as a bearing guard for step bearing 20.
Connected to tube 6, adjacent to its upper'end and above the normal maximum liquid leveljin the tank, is a discharge pipe 23, which at its outer end is connected to a discharge valve or faucet 24. Faucet 24 is provided with a flange 25 which is suitably attached to the side wall 1 8.0
' of the tank. The faucet has a discharge port 26 and a passage 2'? which connects with a pipe 28 leading back into the tank. Attached to faucet 24 is a suitable hand valve for closing and opening port 26. In the present instance, it is shown as comprising a shoe 29 carried by a yoke 30 pivoted on the casing of faucet 24. Attached to the yoke is a handle 31 for moving the valve. 32 and 33 are stops for limiting the movement of the valve, stop 33 being made adjustable 9 so that the opening movement may be adjustably controlled. ,Shoe 29 is pressed into engagement with the end wall of the valve casing by a spring 34 located in a recess inhandle 31, the spring pressing against a spacing block 35 which in turn engages'the adjacent wall of shoe 29. Shoe 29 is provided with a flange 36 which slides on the yoke to form a guide and support ing means for the shoe. Spring '34 serves to press the shoe tightly against the end of valve casing and hold it in such position. In Fig. 1 the valve is shown closed and in Fig. 2 it is shown open.
At the lower end of the tank is an inverted cone shaped deflecting wall 37 supported by 19 ears 33 attached to side walls 1 adjacent to their lower ends, it being provided with a central opening through which tube 6 extends. Tube 6 serves to hold the edges of wall 37 in spaced relation to side walls 1 providing thereby a marginal passage 40 through which paint flows to bottom wall 3.
In the use of the device, paint in a mixed or partially mixed state or ingredients in suitable proportions to form paint are introduced through the opening in top wall 2, dotted line A indicating the maximum height to which the tank is to be filled. Motor 18 is then started, rotating impellers 11 in a direction to effect an upward flow of paint through tube 6. The paint is I caused to flow rapidly up through tube 6 to its upper end where it is discharged partly over the end of the tube beneath disk 21 and partly through pipe 23, casing of valve 24 and pipe 28. The paint is circulated continuously, flowing down Wall 3'7 to wall 3 and then down wall 3 to the lower end of tube 6. This circulation and the beating action of the impellers effects rapid and complete mixing of the ingredients. When it is desired to utilize some of the paint, it is drawn olf by opening valve 24, the valve being opened partially or entirely as found desirable.
Qrdinarily, after the paint has been once mixed, motor 18 is shut down, it being run only when it is desired to draw some paint from. the tank. Whenever the motor is started up to draw paint, a rapid circulation and mixing of the contents of the tank is effected by the 1% i.- pellers. Only a small amount of the total paint being circulated is drawn oil? when the valve is opened. This means that when paint is being drawn from the tank, it is thoroughly mixed as it is drawn oil. In other words, whenever the motor is being operated and paint is being drawn off, a relatively large stream of paint is put into circulation while a relatively small portion of such stream is discharged through valve port 26. This means that always a uniform mixture will be discharged through the valve. In. this connection, it is to be noted that the pain drawn off is a part of the paint being circulated, this result being obtained because pipe 23 is connected to tube 6 above the normal maximum paint level. This means that always the motor must be started up and the paint put into circulation before paint can be drawn off.
With the above described arrangement, the paint is stored in a tank from which it may be drawn readily. No hand mixing of the paint is necessary, a thing which saves considerable time, and always a uniform product is discharged through the faucet. I
The device is simple in structure, clean and efficient in operation, prevents waste of and is capable of being manufactured at low cost.
While I have shown two impellers with bafflers on each side of them, it will be understood-that he device may be operated with a single imler or with more than two impellers and that e bafllers may be omitted, if found desirable.
l accordance with the provision of the patent 1 the mat rial being discharged over the 1' end of the tube, a branch conduit conthe tube below its upper end, but above id level, said branchconduit e2;- rom the tube through the wall of the discharging liquid outside of the tank,
in said branch conduit. a mixing machine, the combination of a tube in the tank in spaced relation to the walls of the tank at each end, the upper end of the tube terminating above the normal liquid ivel in the tank, means'ior effecting ci sulaticn or materials to be mixed upwardly through the tube, the material being discharged over the upper end of the tube, a branch conduit to the tube below its upper end, but above the normal liquid level, said branch conduit extending from'the' tube through the wall of the tanlr for discharging liquid outside the tank, a pipe connecting the outer end of the branch conduit to the interior of the tank, and a valve in said branch conduit.
3. In a mixing machine, the combination of a tank, a tube in the tank in spaced relation to the walls of the tank at each end, the upper end of the tube terminating abovethe normal liquid level in the tank, means for efiecting circulation of materials to be mixed upwardly through the tube,the' material being discharged over the upper end of the tube, a branch oonduit connected to the tube below its upper end, but above the normal liquid level, said branch conduit extending from the tube through the wall of the tank for discharging liquid outside the tanir, a'valve in said branch conduit, and a deflecting wall surrounding the lower end of the tube. r i
FRED'F. 'SCHWENTKER.
US623551A 1932-07-20 1932-07-20 Storage tank and mixing machine Expired - Lifetime US1933346A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438301A (en) * 1945-03-16 1948-03-23 James A Schulte Mixing and self-unloading farm truck
US2517456A (en) * 1947-04-30 1950-08-01 Du Pont Blending apparatus
US2517743A (en) * 1946-09-11 1950-08-08 Vogel Walter Supply reservoir for heavy liquids
US2635859A (en) * 1950-06-12 1953-04-21 Felix W Dreyfus Mixer apparatus
US3106383A (en) * 1960-04-01 1963-10-08 American Mach & Foundry Liquid circulators
US3137481A (en) * 1961-09-25 1964-06-16 Rexim Lab Inc Mixing device
US3249341A (en) * 1963-12-02 1966-05-03 American Mach & Foundry Liquid circulators
US3297307A (en) * 1963-01-30 1967-01-10 Krantz H Multi-stage circulators
US5964527A (en) * 1997-03-19 1999-10-12 Decnop; Coen Hendrik Mixing device
US6402362B1 (en) * 1999-04-29 2002-06-11 Micafil Ag Device for producing a flowable mass

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438301A (en) * 1945-03-16 1948-03-23 James A Schulte Mixing and self-unloading farm truck
US2517743A (en) * 1946-09-11 1950-08-08 Vogel Walter Supply reservoir for heavy liquids
US2517456A (en) * 1947-04-30 1950-08-01 Du Pont Blending apparatus
US2635859A (en) * 1950-06-12 1953-04-21 Felix W Dreyfus Mixer apparatus
US3106383A (en) * 1960-04-01 1963-10-08 American Mach & Foundry Liquid circulators
US3137481A (en) * 1961-09-25 1964-06-16 Rexim Lab Inc Mixing device
US3297307A (en) * 1963-01-30 1967-01-10 Krantz H Multi-stage circulators
US3249341A (en) * 1963-12-02 1966-05-03 American Mach & Foundry Liquid circulators
US5964527A (en) * 1997-03-19 1999-10-12 Decnop; Coen Hendrik Mixing device
US6402362B1 (en) * 1999-04-29 2002-06-11 Micafil Ag Device for producing a flowable mass

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