US3647188A - Airlift blending apparatus - Google Patents
Airlift blending apparatus Download PDFInfo
- Publication number
- US3647188A US3647188A US22640A US3647188DA US3647188A US 3647188 A US3647188 A US 3647188A US 22640 A US22640 A US 22640A US 3647188D A US3647188D A US 3647188DA US 3647188 A US3647188 A US 3647188A
- Authority
- US
- United States
- Prior art keywords
- blending
- gas
- vessel
- divider
- column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
- B01F33/405—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle
- B01F33/4051—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle with vertical conduits through which the material is being moved upwardly driven by the fluid
- B01F33/40512—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle with vertical conduits through which the material is being moved upwardly driven by the fluid involving gas diffusers at the bottom
Definitions
- references Cit d hollow blending column open at its top and bottom, is vertically mounted in the silo with its bottom end spaced from the UNITED STATES PATENTS gas-permeable divider and gas is directed upwardly through the blending column at a velocity higher than the fluidizing gas 2,723,838 1 1/1955 Peters ..259/4 velocity in the silo to circulate material from the Silo upwardly 3,179,378 4/1965 Zenz ..259/4 through the blending column 3,490,655 I/ 1970 Ledgett...
- This invention relates to bulk blending apparatus for the mixing and blending of dry pulverulent materials. Materials to be blended are usually introduced into a suitable bin or vessel. It is essential that the various materials be completely intermingled and mixed prior to being discharged from the vessel. This invention is concerned more specifically with the blending of dry powdered materials that are not free-flowing and which require fluidization, such as cement raw materials.
- Blending can thus be accomplished in a vessel with a porous bottom through which the fluidizing gas is diffused and introduced into the powdered material.
- a further improvement of the aforementioned type of ap- I paratus is disclosed in US. Pat. No. 3,003,752 and U.S. Pat. No. 2,844,361 and includes a vessel provided with a gaspermeable floor.
- the gas-permeable floor is separated into quadrants with means provided for individually varying the amount of airflow through a selected quadrant. In this way, increased airflow through a given quadrant will decrease the density of the air-material mixture above the more active quadrant thereby reducing the pressure of the material over this quadrant.
- the material over the more active quadrant rises upwardly and flows over the top of the fluidized material in the less active adjacent quadrants.
- the more dense material in the less active quadrants flows inwardly to replace the less dense material in the active quadrant thereby promoting the blending action.
- the delineation of the active zone becomes less distinct. This, of course, reduces the blending efficiency of the apparatus.
- This invention relates to a blending system for dry pulverulent material comprising an upright vessel with a material inlet port and a material outlet port, a gas-permeable divider positioned in the vessel and dividing the vessel into an upper material chamber and a plenum chamber, at least one blend ing column vertically mounted inside said vessel, said blending column being hollow and open at its top and bottom with the bottom being spaced from the divider to provide a material intake opening into the blending column, fluidizing gas means in fluid flow communication with the plenum chamber for supplying fluidizing gas to the material chamber through the divider, and blending gas supply means adapted to supply gas into the bottom of the blending column at a velocity higher than that of the fluidizing gas supplied to the material chamber.
- a plurality of blending columns can be used and the columns can be varied in height and/0r can have openings positioned along their length to create intermixing at various levels of the material.
- FIG. I is a sectional view of a blending apparatus of the present invention.
- FIG. 2 is a sectional view of an alternate embodiment of the invention.
- FIG. 3 is a sectional view of a modified form of blending chamber of the apparatus of FIGS. 1 or 2 having openings in the walls thereof;
- FIG. 4 is a modification of the apparatus of FIG. 1 having a material discharge port located in the upper portion of the material chamber.
- a gas-permeable divider 18 which divides the bin into an upper material chamber 27 and a lower plenum chamber 19.
- the divider l8 slopes from all points on the upper surface thereof toward the material outlet port 13.
- the divider of FIG. 1 is an inverted truncated cone and that of FIG. 2 is a sloping trough.
- the divider 18 may be comprised of any suitable gas-permeable medium such as porous stones, fabric or perforated metal and overlies the plenum chamber 19.
- a gas conduit 20 delivers gas under pressure, suitably air for inert materials, to the plenum chamber 19 to provide fluidizing air for the material chamber 27.
- An advantage of the truncated cone-shaped divider 18 is that it assists the flow of material along the upper surface of the divider toward the blending column thus eliminating segregation of the material. This is particularly important in the modification of FIG. 4 in which the cutoff valve 16 is closed and the blender operates continuously with the material discharging through a material discharge conduit 15 located in the upper portion of the material chamber 27. In this arrangement of FIG. 4, the material conduit 15' acts like a material overflow to discharge material in a continuous operation. The cutoff valve 16 is then used as a cleanout valve for removing oversized particles from the material chamber.
- Like parts of the apparatus of FIG. 4 have the same numerals as FIG. 1 and operate in the same manner as described with reference to FIG. 1.
- a hollow blending column 21 in the form of a cylindrical tube or casing and open at its top and bottom and having a funnel-shaped bottom 23 is mounted vertically in the vessel 10.
- the blending chamber 21 is connected to the vessel by connecting means, such as metal rods 22, and the lower end of the chamber is spaced from the divider 18 to provide a material intake opening 28.
- Nozzles 24 receive gas from the gas conduit 20 and direct a higher velocity gas into the blending column 21. This higher velocity gas has a greater lifting action than the fluidizing air passing through the gas-permeable divider 18, thereby creating a less dense column of material in the column 21.
- the less dense column is displaced upwardly through the column 21 by the more dense material flowinginto the chamber through intake opening 28.
- FIG. 2 is shown a form of the invention in which a plurality of blending columns 21' of varying heights are mounted in the material vessel by supports (not shown) in a manner similar to the chamber 21 in FIG. I.
- the varying heights permit discharge of material at different levels, thus creating intermixing of different levels of material.
- the columns may, of course, be of the same height.
- a separate gas conduit 26 is utilized for supplying the blending gas to the nozzles 24. This permits better control of the velocities of the fluidizing gas supplied by gas conduit 20 and blending gas supplied by conduit 26. One velocity can be modified without directly affecting the other, thus permitting rapid adjustments that may be necessary due to the condition of or type or material to be blended.
- FIG. 3 is shown a modified form of blending column of the type shown in FIGS. 1 and 2, but containing a plurality of openings 25 through its wall at various elevations. These openings permit partial flow of material into and out of the blending column at various levels, thereby intermingling the material in the column with materials at various levels in the material chamber 27. It will be understood that the openings may be only at the top, or bottom, or any combination of positions of the column dependent upon the blending conditions desired.
- a low volume of air is supplied into the plenum chamber 19 of the vessel to provide fluidizing air to pass up through the divider 18 and into the vessel 10. Fluidizing air at a substantially higher volume is directed into the blending column 21 or 21' for expanding material in the chamber.
- the expanded material column in the column is less dense, and therefore, has less-pressure head than the surrounding material in the material chamber 27.
- a material flow pattern is thereby established with the high-pressure material surrounding the vertical blending column flowing toward and into the bottom of the blending column and being displaced upwardly through the chamber and out through the top of the column and across the top of the material in the vessel, as shown by the arrows.
- the degree of mixing can be varied by the provision of additional vertical columns disposed within the vessel, by making the columns of different heights, thus providing discharge zones at different levels in the vessel thereby creating mixing of different levels within the vessel, and by providing the column or columns with openings at various points along their length which permits partial flow of material into and out of the column at various elevations.
- a blending system for dry pulverulent material comprising an upright vessel with a material inlet port and a material outlet port, a gas-permeable divider positioned in the vessel dividing the vessel into a material chamber and a lower plenum chamber, said gas permeable divider being in the general form of an inverted truncated cone, at least one blending column vertically mounted inside said vessel and extending upwardly from said divider, said blending column being hollow and open at its top and bottom with the bottom being spaced from the divider to provide a material-intake opening into the blending column, fluidizing gas means in fluid flow communication with the vessel for supplying fluidizing gas to the material chamber through the divider, and blending gas supply means adapted to supply gas into the bottom of the blending column at a velocity higher than that of the fluidizing gas supplied to the material chamber.
Abstract
Description
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2264070A | 1970-03-25 | 1970-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3647188A true US3647188A (en) | 1972-03-07 |
Family
ID=21810637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US22640A Expired - Lifetime US3647188A (en) | 1970-03-25 | 1970-03-25 | Airlift blending apparatus |
Country Status (5)
Country | Link |
---|---|
US (1) | US3647188A (en) |
CA (1) | CA936524A (en) |
DE (1) | DE2106591A1 (en) |
FR (1) | FR2084721A5 (en) |
GB (1) | GB1279799A (en) |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3756569A (en) * | 1969-07-23 | 1973-09-04 | Bayer Ag | Apparatus for mixing and homogenising bulk material and method of operating the apparatus |
US3807705A (en) * | 1972-06-28 | 1974-04-30 | Du Pont | Process and apparatus for solids blending |
US3887337A (en) * | 1971-08-19 | 1975-06-03 | Studiecentrum Kernenergi | Fluidization column |
US3953003A (en) * | 1974-06-06 | 1976-04-27 | Aluterv Aluminiumipari Tervezo Vallalat | Tank provided with pneumatic mixing pipe |
US3955717A (en) * | 1969-08-06 | 1976-05-11 | Landau Richard E | Methods and apparatus for flowing archable materials |
US4042220A (en) * | 1975-10-02 | 1977-08-16 | E. I. Du Pont De Nemours And Company | Apparatus for solids blending |
US4097026A (en) * | 1975-01-24 | 1978-06-27 | Vyzkumny Ustav Vodohospodarsky | Apparatus for mixing a basic liquid substance with other media |
US4185926A (en) * | 1978-02-28 | 1980-01-29 | Westinghouse Electric Corp. | Safe-geometry pneumatic nuclear fuel powder blender |
US4466082A (en) * | 1982-02-02 | 1984-08-14 | Foster Wheeler Energy Corporation | Apparatus for mixing and distributing solid particulate material |
US4569596A (en) * | 1985-11-26 | 1986-02-11 | Fuller Company | Pneumatic conveying and material blending apparatus and method |
US4577972A (en) * | 1980-10-15 | 1986-03-25 | Westinghouse Electric Corp. | Spouted bed blender apparatus |
US4630931A (en) * | 1984-02-28 | 1986-12-23 | Magyar Aluminiumipari Troszt | Process and apparatus for the mixing of slurries |
US4740087A (en) * | 1986-12-16 | 1988-04-26 | Illinois Tool Works Inc. | Magnetic particle bath suspension apparatus |
US4782843A (en) * | 1987-05-15 | 1988-11-08 | James Lapaglia | Apparatus for cleaning particulate material |
DE3739976A1 (en) * | 1987-11-19 | 1989-06-08 | Ts Ex I Kt Lab Khim Selskogo | Compressed-air mixer for pourable materials |
US4944598A (en) * | 1989-05-10 | 1990-07-31 | Dynamic Air Inc. | Continuous flow air blender for dry granular materials |
US20040233776A1 (en) * | 2003-05-21 | 2004-11-25 | Dynamic Air Inc. | Blender |
US20070258318A1 (en) * | 2006-05-08 | 2007-11-08 | Douglas Lamon | Method And Apparatus For Reservoir Mixing |
WO2009097969A1 (en) * | 2008-02-09 | 2009-08-13 | Uhde Gmbh | Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system |
US20100232254A1 (en) * | 2007-02-27 | 2010-09-16 | Chicago Bridge & Iron Company | Liquid storage tank with draft tube mixing system |
US20110058905A1 (en) * | 2008-05-21 | 2011-03-10 | Uhde Gmbh | Device for discharging a solid material from a container |
CN101227969B (en) * | 2005-07-28 | 2013-01-30 | 株式会社小原 | Gas discharge device and glass manufacturing method |
US8646664B2 (en) | 2008-03-17 | 2014-02-11 | Thyssenkrupp Uhde Gmbh | Method and device for the metered removal of a fine to coarse-grained solid matter or solid matter mixture from a storage container |
US20190021221A1 (en) * | 2017-07-18 | 2019-01-24 | Cnh Industrial Canada, Ltd. | Air-Assisted Agitation For Tanks Of Application Equipment |
RU2703311C1 (en) * | 2019-04-15 | 2019-10-16 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный аграрный университет" (ФГБОУ ВО Донской ГАУ) | Bunkering device for collapse of arches of bulk material |
US10836567B2 (en) * | 2016-02-17 | 2020-11-17 | Mitsubishi Hitachi Power Systems, Ltd. | Pulverized-fuel supply unit and method, and integrated gasification combined cycle |
WO2022003004A1 (en) * | 2020-07-01 | 2022-01-06 | Eos Gmbh Electro Optical Systems | Mixing device for producing a powder mixture |
EP4197628A1 (en) * | 2021-12-20 | 2023-06-21 | EOS GmbH Electro Optical Systems | Mixing device for producing a powder mixture |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3729175A (en) * | 1971-03-12 | 1973-04-24 | Fuller Co | Blending apparatus |
CA1211142A (en) * | 1984-04-04 | 1986-09-09 | Robert E. Romanchik | Pneumatic conveying and material blending apparatus and method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE543647A (en) * | ||||
DE539141C (en) * | 1930-10-21 | 1931-11-21 | Polysius A G G | Method and device for mixing flour-like or dusty material |
US2723838A (en) * | 1952-11-15 | 1955-11-15 | Kloeckner Humboldt Deutz Ag | Apparatus for mixing and homogenizing pulverulent or fine-grained materials |
US3179378A (en) * | 1962-12-26 | 1965-04-20 | Ducon Co | Apparatus for mixing and transporting finely divided solids |
US3351326A (en) * | 1964-10-07 | 1967-11-07 | Rexall Drug Chemical | Process and apparatus for solids blending |
US3490655A (en) * | 1966-08-17 | 1970-01-20 | Colgate Palmolive Co | Material blending silo |
-
1970
- 1970-03-25 US US22640A patent/US3647188A/en not_active Expired - Lifetime
-
1971
- 1971-02-05 CA CA104583A patent/CA936524A/en not_active Expired
- 1971-02-11 DE DE19712106591 patent/DE2106591A1/en active Pending
- 1971-03-16 FR FR7109216A patent/FR2084721A5/fr not_active Expired
- 1971-04-19 GB GB21234/71A patent/GB1279799A/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE543647A (en) * | ||||
DE539141C (en) * | 1930-10-21 | 1931-11-21 | Polysius A G G | Method and device for mixing flour-like or dusty material |
US2723838A (en) * | 1952-11-15 | 1955-11-15 | Kloeckner Humboldt Deutz Ag | Apparatus for mixing and homogenizing pulverulent or fine-grained materials |
US3179378A (en) * | 1962-12-26 | 1965-04-20 | Ducon Co | Apparatus for mixing and transporting finely divided solids |
US3351326A (en) * | 1964-10-07 | 1967-11-07 | Rexall Drug Chemical | Process and apparatus for solids blending |
US3490655A (en) * | 1966-08-17 | 1970-01-20 | Colgate Palmolive Co | Material blending silo |
Cited By (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3756569A (en) * | 1969-07-23 | 1973-09-04 | Bayer Ag | Apparatus for mixing and homogenising bulk material and method of operating the apparatus |
US3955717A (en) * | 1969-08-06 | 1976-05-11 | Landau Richard E | Methods and apparatus for flowing archable materials |
US3887337A (en) * | 1971-08-19 | 1975-06-03 | Studiecentrum Kernenergi | Fluidization column |
US3807705A (en) * | 1972-06-28 | 1974-04-30 | Du Pont | Process and apparatus for solids blending |
US3953003A (en) * | 1974-06-06 | 1976-04-27 | Aluterv Aluminiumipari Tervezo Vallalat | Tank provided with pneumatic mixing pipe |
US4097026A (en) * | 1975-01-24 | 1978-06-27 | Vyzkumny Ustav Vodohospodarsky | Apparatus for mixing a basic liquid substance with other media |
US4042220A (en) * | 1975-10-02 | 1977-08-16 | E. I. Du Pont De Nemours And Company | Apparatus for solids blending |
US4185926A (en) * | 1978-02-28 | 1980-01-29 | Westinghouse Electric Corp. | Safe-geometry pneumatic nuclear fuel powder blender |
US4577972A (en) * | 1980-10-15 | 1986-03-25 | Westinghouse Electric Corp. | Spouted bed blender apparatus |
US4466082A (en) * | 1982-02-02 | 1984-08-14 | Foster Wheeler Energy Corporation | Apparatus for mixing and distributing solid particulate material |
US4630931A (en) * | 1984-02-28 | 1986-12-23 | Magyar Aluminiumipari Troszt | Process and apparatus for the mixing of slurries |
US4569596A (en) * | 1985-11-26 | 1986-02-11 | Fuller Company | Pneumatic conveying and material blending apparatus and method |
US4740087A (en) * | 1986-12-16 | 1988-04-26 | Illinois Tool Works Inc. | Magnetic particle bath suspension apparatus |
US4782843A (en) * | 1987-05-15 | 1988-11-08 | James Lapaglia | Apparatus for cleaning particulate material |
DE3739976A1 (en) * | 1987-11-19 | 1989-06-08 | Ts Ex I Kt Lab Khim Selskogo | Compressed-air mixer for pourable materials |
US4944598A (en) * | 1989-05-10 | 1990-07-31 | Dynamic Air Inc. | Continuous flow air blender for dry granular materials |
US20040233776A1 (en) * | 2003-05-21 | 2004-11-25 | Dynamic Air Inc. | Blender |
US7267475B2 (en) | 2003-05-21 | 2007-09-11 | Dynamic Air Inc. | Blender |
CN101227969B (en) * | 2005-07-28 | 2013-01-30 | 株式会社小原 | Gas discharge device and glass manufacturing method |
US20070258318A1 (en) * | 2006-05-08 | 2007-11-08 | Douglas Lamon | Method And Apparatus For Reservoir Mixing |
US8287178B2 (en) | 2006-05-08 | 2012-10-16 | Landmark Structures I, L.P. | Method and apparatus for reservoir mixing |
US8790001B2 (en) | 2006-05-08 | 2014-07-29 | Landmark Structures I, L.P. | Method for reservoir mixing in a municipal water supply system |
US20080151684A1 (en) * | 2006-05-08 | 2008-06-26 | Douglas Lamon | Method and Apparatus for Reservoir Mixing |
US8118477B2 (en) * | 2006-05-08 | 2012-02-21 | Landmark Structures I, L.P. | Apparatus for reservoir mixing in a municipal water supply system |
US20100232254A1 (en) * | 2007-02-27 | 2010-09-16 | Chicago Bridge & Iron Company | Liquid storage tank with draft tube mixing system |
US8157432B2 (en) * | 2007-02-27 | 2012-04-17 | Chicago Bridge & Iron Company | Method of mixing a fluid in a tank with a draft tube mixing system |
US20100322721A1 (en) * | 2008-02-09 | 2010-12-23 | Uhde Gmbh | Method and apparatus for receiving fine-grained to coarse-grained solids from a vessel and transferring them to a higher-pressure system |
AU2009211886B2 (en) * | 2008-02-09 | 2012-09-13 | Thyssenkrupp Uhde Gmbh | Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system |
WO2009097969A1 (en) * | 2008-02-09 | 2009-08-13 | Uhde Gmbh | Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system |
RU2469939C2 (en) * | 2008-02-09 | 2012-12-20 | Тиссенкрупп Уде Гмбх | Method and device for receiving and transferring fine to coarse substances from bin to high pressure system |
CN101939235B (en) * | 2008-02-09 | 2012-07-18 | 犹德有限公司 | Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system |
US8646664B2 (en) | 2008-03-17 | 2014-02-11 | Thyssenkrupp Uhde Gmbh | Method and device for the metered removal of a fine to coarse-grained solid matter or solid matter mixture from a storage container |
US20110058905A1 (en) * | 2008-05-21 | 2011-03-10 | Uhde Gmbh | Device for discharging a solid material from a container |
US10836567B2 (en) * | 2016-02-17 | 2020-11-17 | Mitsubishi Hitachi Power Systems, Ltd. | Pulverized-fuel supply unit and method, and integrated gasification combined cycle |
US20190021221A1 (en) * | 2017-07-18 | 2019-01-24 | Cnh Industrial Canada, Ltd. | Air-Assisted Agitation For Tanks Of Application Equipment |
US10687460B2 (en) * | 2017-07-18 | 2020-06-23 | Cnh Industrial Canada, Ltd. | Air-assisted agitation for tanks of application equipment |
RU2703311C1 (en) * | 2019-04-15 | 2019-10-16 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный аграрный университет" (ФГБОУ ВО Донской ГАУ) | Bunkering device for collapse of arches of bulk material |
WO2022003004A1 (en) * | 2020-07-01 | 2022-01-06 | Eos Gmbh Electro Optical Systems | Mixing device for producing a powder mixture |
EP4197628A1 (en) * | 2021-12-20 | 2023-06-21 | EOS GmbH Electro Optical Systems | Mixing device for producing a powder mixture |
Also Published As
Publication number | Publication date |
---|---|
GB1279799A (en) | 1972-06-28 |
CA936524A (en) | 1973-11-06 |
DE2106591A1 (en) | 1971-10-14 |
FR2084721A5 (en) | 1971-12-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 228 EAST 45 Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY, A DE CORP;REEL/FRAME:004659/0543 Effective date: 19861231 Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., A CORP OF D Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY, A DE CORP;REEL/FRAME:004659/0543 Effective date: 19861231 |
|
AS | Assignment |
Owner name: BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUND Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY;REEL/FRAME:004994/0255 Effective date: 19881214 |
|
STCK | Information on status: patent revival |
Free format text: ABANDONED - RESTORED |
|
AS | Assignment |
Owner name: FULLER COMPANY, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:SECURITY PACIFIC BUSINESS CREDIT INC.;REEL/FRAME:005251/0122 Effective date: 19881214 |
|
AS | Assignment |
Owner name: FULLER COMPANY, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BARCLAYS BUSINESS CREDIT, INC., A CORP OF CT;REEL/FRAME:005465/0255 Effective date: 19900912 |