US3834118A - Dripless vacuum nozzle - Google Patents

Dripless vacuum nozzle Download PDF

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Publication number
US3834118A
US3834118A US00394374A US39437473A US3834118A US 3834118 A US3834118 A US 3834118A US 00394374 A US00394374 A US 00394374A US 39437473 A US39437473 A US 39437473A US 3834118 A US3834118 A US 3834118A
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United States
Prior art keywords
nozzle
section
barrel
passageway
valve
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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
Application number
US00394374A
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English (en)
Inventor
T Waldrop
R Hawkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WR Grace and Co Conn
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WR Grace and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WR Grace and Co filed Critical WR Grace and Co
Priority to US00394374A priority Critical patent/US3834118A/en
Priority to ZA00745440A priority patent/ZA745440B/xx
Priority to CA208,316A priority patent/CA1009625A/en
Priority to JP10061674A priority patent/JPS5717772B2/ja
Priority to AU72979/74A priority patent/AU481120B2/en
Application granted granted Critical
Publication of US3834118A publication Critical patent/US3834118A/en
Assigned to W.R. GRACE & CO.-CONN, A CORP. OF CT reassignment W.R. GRACE & CO.-CONN, A CORP. OF CT MERGER (SEE DOCUMENT FOR DETAILS). MAY 25, 1988 Assignors: GRACE MERGER CORPORATION, W.R. GRACE & CO.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/04—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
    • B65B31/06—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzle being arranged for insertion into, and withdrawal from, the mouth of a filled container and operating in conjunction with means for sealing the container mouth

Definitions

  • ABSTRACT This invention is a dripless vacuum nozzle for use in an apparatus for vacuum packaging articles in flexible pouches or bags.
  • the neck of a filled bag is placed around the barrel of the nozzle, and downward movement of the barrel clamps the bag neck between the barrel and a plunger located in and below the opening to the barrel.
  • the bag remains in this clamped position as it is evacuated completely afterwhich it is sealed and severed from the clamp.
  • a pivotally operated ball valve, drip collection cup, and ball check valve prevent any moisture from dripping into the package while it is being evacuated.
  • This invention relates to a nozzle for a vacuum packaging apparatus. Particularly, this invention relates to nozzles for the vacuum packaging of articles in flexible, relatively impervious pouches or bags.
  • the articles packaged are preferably, poultry, ham, and like food products.
  • Another object of the present invention is to provide a vacuumizing apparatus which is simpler and easier for an operator to load and use than those in the prior art.
  • Another object of the present invention is to provide a nozzle which prevents dripping of moisture back into the bagged product.
  • the preferred nozzle of the present invention is one having a barrel slidably mounted in a cover and having upper and lower nozzle portions coaxially positioned in the barrel.
  • the upper and lower portions have communicating passageways therethrough and are resiliently held together with a ball valve therebetween.
  • Attached to the lower end of the lower nozzle portion is a flared resilient plunger which is positioned outside of the barrel so that a bag neck can be clamped therebetween.
  • the lower nozzle portion can be swung a limited distance like a pendulum and such motion will open the ball valve between the nozzle portions. When the ball valve is opened.
  • the central vacuum duct or passageway in the upper portion will reduce pressure in the barrel, and the barrel, being slidably mounted, will move down upon the plunger under the force created by the air pressure differential thus clamping the bag between the plunger and the barrel and at the same time lowering the pressure in the interior of the bag through the passageway in the lower nozzle portion.
  • This clamping action will hold a filled bag.
  • the vacuum valve and clamping action are released by the introduction of compressed air into the barrel.
  • FIG. 1 is a perspective view of a vacuum packaging apparatus which can utilize the nozzles of the present invention
  • FIG. 2 is a schematic representation of a sectional elevation view looking from the lower left-hand side of FIG. 1;
  • FIG. 3 is a view of a vertical section through one embodiment of the nozzle of the present invention.
  • FIG. 4a is a partial vertical section view showing the nozzle of FIG. 3 when the vacuum valve is open and a bag is positioned around the barrel of the nozzle;
  • FIG. 4b is the same view as FIG. 4a except that the barrel has descended and clamped the bag to the nozzle;
  • FIG. 5 is a horizontal sectional view showing the layout of the driving means and synchronous means for said vacuum packaging apparatus
  • FIG. 6a is a schematic representation of the use of said apparatus with a straight-through conveyor
  • FIG. 6b is a schematic representation of an alternate arrangement of conveyor belts for use with said apparatus
  • FIG. 7a is a partial top plan view of the product locator which may be used in cooperation with the nozzle of the subject invention.
  • FIG. 7b is a side elevation view of the product locator showing its operation in cooperation with the nozzle of the present invention.
  • each arm 5 is a nozzle cover 6 in which a barrel 7 is slidably mounted.
  • a flared ring or clamping plunger 8 extends .downwardly from the downwardly facing opening of the barrel 7 so that when a bag 10 filled with a product 9 has its neck placed around the barrel 7, the downward movement of the barrel 7 will clamp the neck of the bag and hold and support same.
  • Extending outwardly on support arm 63 is the bag closing and severing means or clipper and cutter 14 which has a clipper gate 15 through which the product enters and which gathers and compresses the bag neck before the bag is closed by clipping and then severed.
  • the clips are fed from a magazine 16 and the closing and sealing means 14 drive the clips completely around the gathered bag neck before the bag is severed between nozzle and the clip.
  • Motion transfer member 17 is mounted for oscillating movement and carries arm 63 which supports the clipper l4. Attached to the motion transfer member 17 is crank drive arm 21 which is attached to crank drive wheel 22.
  • the crank drive wheel 22 is on a common shaft with the turret drive pinion l9 and this common shaft is powered by the driving means or motor 18.
  • crank arm 21 translates the rotary motion of crank drive wheel 22 into linear oscillating motion and, through motion transfer member 17 and support arm 63, oscillates clipper 14.
  • the turret drive pinion 19 has twenty gear. teeth and the turret gear 20 has 120 teeth, thus the drive pinion 19 makes six revolutions for each revolution of the turret.
  • crank 21 makes six complete oscillations for each revolution of the turret so that there is acomplete oscillation of the clipper 14 for each of the nozzles 7.
  • the diameter of the crank wheel 22 and the length of the crank arm 21 are set so that the stroke of thecrank arm 21 will move clipper'l4 at the same angular velocity of nozzle 7.
  • clipper 14 is synchronized to meet a nozzle 7 at the extremity of, its clockwise stroke and then move counterclockwise with the nozzle through an are on during which time the clipping and severing are accomplished.
  • the nozzles continue in their counterclockwise rotation next nozzle which has in the meantime moved 30 counterclockwise, the nozzles being set at 60 intervals.
  • cam shaft drive gear 23 To the left of drive pinion 20 is cam shaft drive gear 23.
  • the cam gear 23 turns cam shaft 29 which is located in housing 24.
  • Three cams on cam shaft 29 together with a switch onthe clipper control the sequence of the clippers operation.
  • the clipper switch (not shown), when struck by the clipper barrel, closes the clipper gate and turns on the air supply tothe cam controlled switches that follow.
  • Cam 30 actuates the clipper hammer which drives the clips securely around the bag neck
  • cam 31 controls the cutter which severs the bag from the nozzle
  • cam 32 resets the switches for the next cycle.
  • Each cam operates a pneumatic switch (not shown) which sends compressed air to the specified mechanism.
  • Rods 33, 34, and '35 extend to the right-hand side of FIG.
  • a notch (not shown) is provided in the nozzle'barrel so that when'a nozzle is not loaded and lowered with a filled bag, the switch will pass through the notch and the clipper will not operate.
  • the compressed air for the apparatus is'supplied through line 27 which may be attached to a conventional compressor.
  • Lines enter the apparatus at the bottom at port 39 and and a compressed air delivery tube 41 is provided by hollow support shaft 3.
  • the bottom of support shaft 3 is journaled in sealed bearing 40.
  • Support shaft 3 passes through a second sealed journal 40a and immediately above is attached to turret drive gear 20 which rotatably drives the shaft 3.
  • the shaft continues upwardly passing through the member 17 and terminates in supporting relationship with plenum 51.
  • the compressed air line 41 does not enter plenum 51.
  • the walls of plenum 51 in turn supportthe turret 4.
  • the compressed air line 41 delivers compressed air to trunk line 42 from which compressed air lines (not shown) deliver air to switch inlets 43 of switch 46.
  • switch outlet 44 which is in switch housing 45 is attached to a second vacuum line 48 (see FIG. 3) which is attached to nozzle barrel 7.
  • the compressed air switch 46 is actuated by striker plate 47 as the switch rotates with the turret.
  • a charge of compressed air is sent to the interior of the nozzle barrel 7 to release the nozzles from their clamping engagement with the bag as will be explained in greater detail hereinafter.
  • vacuum line 26 delivers vacuum through delivery port 50 to plenum chamber 51.
  • the arms 5 extend outwardly as hollow tubes delivering vacuum to the nozzle covers 6.
  • FIG. 3 the end of arm 5 is shown in cover 6 and the hollow interior 52 'of the tube 5 communicates with passageway 53a in cover 6.
  • This passageway joins with the passageway 53 in upper nozzle section 54 and continues down through the center of the upper nozzle section.
  • the upper nozzle terminates in a lock 81 at'its upper extremity which is keyed or pinned by pin 82 so that the nozzle will not rotate.
  • Seals 87 are provided along the shaft of upper nozzle section 54 so there will be no leakage around its outer surfaces.
  • the barrel 7 of the nozzle is resiliently carried by upper nozzle section 54 through coaxial coil spring 55.
  • nozzle barrel 7 can slide upwardly and downwardly where cover surface 60 and nozzle barrel surface 61 meet.
  • the spring rests on a shoulder at the lower part of upper nozzle section 54 and below the shoulder is valve pivot member 73.
  • Member 73 serves both as a pivot for opening and closing the ball valve and as a seat for the ball 83.
  • the open seat of the valve is aligned with passageway 53.
  • Lower nozzle section 56 has inlet 77 in connecting with an interior vertical passageway which terminates in nozzle opening 59.
  • Lower nozzle 56 is at a slight angle with respect to the vertical.
  • the lower part of the lower nozzle section 56 has a flared rubber or resilient ring 58 which completely encircles the lower section 56. This flared locking-ring 58 also serves as a locking plunge
  • FIGS. 4a and 4b the operation of the vacuum nozzle will be explained. An operator places the neck of the bag 10 around barrel 7 of the nozzle,
  • the flexible wall of the bag 10 will always be pulled into the barrel opening to be wedged completely around the periphery of the barrel opening as shown in FIG. 4b because the vacuum acts to draw the bag neck walls against the plunger 58 and partially into the barrel cavity before the barrel 7 descends. Since a very high vacuum is employed, usually approaching 29 inches of mercury, the initial evacuation of the barrel and bag, and hence, the descent of the barrel, take place almost instaneously.
  • nozzles of the present type are vacuum packaging of meat and poultry products. These products will have residual water, blood, and other fluids present which will vaporize when subjected to very low pressures and thus be drawn out of the package along with the air. However, at points along the air evacuation route varying pressures because of local throttling effects and changes in surface temperatures will cause the moisture to reappear as condensate. Referring again to FIG. 3, the dripless feature of the present invention will be described.
  • a vertical wall 78 rises to form a cup which partially encloses the lower part of upper nozzle section 54.
  • a connecting ring 79 is provided at the top of wall 78 to connecting coil spring 80 to wall 78.
  • Spring 80 is attached to the upper outer periphery of pivot member 73 and spring 80 provides the resilient means for holding ball valve 83 closed.
  • spring 80 provides the resilient means for holding ball valve 83 closed.
  • a charge of compressed air is supplied through port 49. This serves to unlock the clamping action by driving the mouth or opening of barrel 7 up off plunger ring 58.
  • the compressed air charge is actuated by compressed air switch 46 striking striker plate 47 as explained in the description of FIG. 2. Striker plate 47 is located so that switch 46 will be struck as a nozzle leaves a clipper or sealing and severing means.
  • FIG. 5 shows the layout of the turret drive gear and the crank which oscillates the clipper arm.
  • This view is with the turret and upper housing removed and is looking down on the gear-and drive area.
  • the motor drive pinion 19 is below crank wheel 22, but crank wheel 22 and the drive pinion turn at the same angular velocity being driven off the common vertical shaft from the drive means which is an electric motor.
  • Connecting rod or crank arm 21 is shown connected to a portion of the motion transfer member 17. This is the member which carries the arm 63 which support the clipper.
  • the drive pinion turns the turret drive gear and the central support shaft 3 is fixed to the hub of gear 20.
  • the central compressed air delivery channel 41 which is the hollow portion of support shaft 3 is also shown in this view as is cam shaft drive gear 23.
  • FIGS. 6a and 6b two of the several possible arrangements of the vacuum apparatus using the nozzles of the present invention with conveyor belts are shown.
  • the product 9 is shown moving in the direction of the arrows on the conveyor belt 65.
  • the product 9 will usually have been bagged before reaching this point, the bagging having been done by automatic machinery downstream of the conveyor. However, in some instances the operator may bag the product at this point.
  • the operator 66 takes a bag filled with the product 9 and places the neck of the bag around the nozzle barrel, swinging the plunger into vertical position as he does so. This initially evacuates the bag and actuates the clamping of the bag between the nozzle barrel and the plunger. From the point at which the operator 66 in FIG.
  • control box 13 is placed within convenient reach of the operator 66 so that he may start and stop the apparatus as needed. (The location of control box 13 is also shown in FIG. 1.) Opposite the control box 13 is an auxiliary control box 69 which is so placed so that if an emergency were to arise, another person from the other side of the conveyor belt could reach across and shut off the apparatus. In this arrangement, the product 9 exits traveling in the same direction it entered.
  • FIG. 6b another arrangement is shown with a counterclockwise rotating apparatus.
  • operator 66 removes a bagged product from the infeed conveyor 67 and places it on the nozzle which rotates around to the clipper. Subsequently, the clipper seals and severs the bag dropping it onto outfeed conveyor 68. The product here exits in the direction opposite to which it entered.
  • FIGS. 7a and 7b a product spacer or guide 70 is shown attached to the clipper unit 14.
  • the locating notch 71 on the spacer arm 70 is preferably about the same length as l/6 of the path traveled by a nozzle in a complete rotation. Thus, where six nozzles are used, the positioning notch 71 is about 60 around a circle from clipper 14.
  • FIG. 7b a side view of the spacer arm 70 is shown with a bag 10 filled with product 9. While the apparatus can be successfully loaded by an operator without the guide arm 70, the arm 70 provides assistance in spacing the product 9 from the nozzle 10 and forces the product 9 all the way to the bottom of the bag, thus eliminating folds and crevices where air might be trapped. This arm, of course, can be adjusted for the various size products.
  • the sealing and severing means or clipper 14 has not been described in detail as a satisfactory clipper 14 is commercially available.
  • a suitable clipper for counterclockwise rotation of the apparatus of the present invention is Model Z-3l06 from the Tipper-Tie Division of Rheem Manufacturing Company of New York, New York.
  • For clockwise rotation clipper Model Z-3l07 from the same company can be used.
  • Other sealing and severing means which can, with some modification, be used are those devices described in either of the following U.S. Pats: No. 3,394,528 issued to M. J. G. Tipper or No. 3,046,713 issued to K. E. Belknap.
  • dripless vacuum nozzle of the present invention has been described as it can be used with one specific rotary vacuum packaging apparatus, it may be used with other apparati.
  • a single nozzle can simply be suspended from a movable vacuum line or source and the operator can place a filled bag around the nozzle barrel as illustrated in FIGS. 4a and 4b. After evacuation is completed the bag may be moved manually to a clipper while still clamped to the nozzle'and there the bag will be closed and severed; or, if desired manual clipping and severing out be employed.
  • the present nozzle isnot limited to use with a specific apparatus but may be used with various vacuum packaging devices.
  • a dripless vacuum nozzle comprising:
  • a lower nozzle section having an upper peripheral wall defining a moisture collecting cup, said cup having a diameter sufficient to receive a lower extremity of said upper section, and said lower section having a passageway therethrough;
  • valve pivot member having an open valve seat therein, said pivot member being connected to the lower extremity of said upper section and said open valve seat being alinged with the passageway in said upper section;
  • a ball valve member disposed on the upper surface of said lower section, said ball member being aligned to fit in said valve seat and to close same, and the height of said ball member with respect to said pivot, member being such that the lower nozzle section tilts from vertical alignment within said barrel when said ball valve is closed;
  • check valve means in the passageway in said lower section, said check valve means opening and closing in response to differential air pressure whereby, when said lower section is tilted so that it is vertical, air can be withdrawn through the passageway in said upper portion, through said ball valve, and through said passageway in said lower section to open said check valve thereby making a complete evacuation path to the lower tip of said lower section.
  • a dripless nozzle comprising:
  • first spring means connecting said barrel to said 65 upper nozzle section
  • a pivot member attached to the bottom of said upper section, said pivot member having a valve seat therein aligned with the passageway in said upper section; l a lower nozzle section having a vertical peripheral wall surrounding its upper surface, said lower section having an opening in its lower surface connecting to a continuous passageway which opens on said lower sections upper surface, and the lower portion of said lower section flaring outwardly to a diameter greater that than of said barrel to form a clamping plunger;
  • valve ball in the upper surface of said lower sec tion situated to close the valve seat in said pivot member; said valve ball and said second spring means co-operating to tilt said lower section from vertical when said valve ball closes said valve seat;
  • a check valve in the passageway of said lowerse'c' tion, said check valve opening in response to a decrease in upstream air pressure and closing when the upstream and downstream pressures equalize;
  • vacuum means for applying negative air pressure through the passageway in said upper nozzle section whereby when the neck of a filled bag is placed around said barrel and said lower section is made vertical, said valve ball will open admitting the vacuum in said passageway into the barrel and lower section passageway causing the housing to descend and clamp the bag neck between said plunger and housing and also causing the check valve to open to completely evacuate said bag and upon completion of the evacuation of the bag the check valve closes thereby preventing moisture from dripping into said bag.
  • the dripless nozzle of claim 4 including means for introducing compressed air into said barrel to release the clamp between said plunger and said housing.
  • a dripless vacuum nozzle comprising:
  • each section having a vertical passageway therethrough;
  • valve pivot member connected to the lower extremity of said upper section, said pivot member having a valve seat therein aligned with said ball member and with the passageway in said upper section;
  • the dripless vacuum noale of claim 7 including home valve means in said lower section, said check valve means opening and closing in response to differential air pressure.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vacuum Packaging (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
US00394374A 1973-09-04 1973-09-04 Dripless vacuum nozzle Expired - Lifetime US3834118A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00394374A US3834118A (en) 1973-09-04 1973-09-04 Dripless vacuum nozzle
ZA00745440A ZA745440B (en) 1973-09-04 1974-08-26 Dripless vacuum nozzle
CA208,316A CA1009625A (en) 1973-09-04 1974-09-03 Dripless vacuum nozzle
JP10061674A JPS5717772B2 (enrdf_load_stackoverflow) 1973-09-04 1974-09-03
AU72979/74A AU481120B2 (en) 1973-09-04 1974-09-04 Dripless vacuum nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00394374A US3834118A (en) 1973-09-04 1973-09-04 Dripless vacuum nozzle

Publications (1)

Publication Number Publication Date
US3834118A true US3834118A (en) 1974-09-10

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ID=23558695

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Application Number Title Priority Date Filing Date
US00394374A Expired - Lifetime US3834118A (en) 1973-09-04 1973-09-04 Dripless vacuum nozzle

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US (1) US3834118A (enrdf_load_stackoverflow)
JP (1) JPS5717772B2 (enrdf_load_stackoverflow)
CA (1) CA1009625A (enrdf_load_stackoverflow)
ZA (1) ZA745440B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137954A (en) * 1976-09-04 1979-02-06 Enzinger-Union-Werke Ag Liquids containers
US4745730A (en) * 1986-10-22 1988-05-24 Bartle Sr David C Method and apparatus for evacuating air from food containers
US5829223A (en) * 1996-07-10 1998-11-03 Rwc, Incorporated Apparatus for charging canisters with a high pressure gas
US20100263157A1 (en) * 2009-04-15 2010-10-21 Samsung Techwin Co., Ltd. Vacuum nozzle control apparatus and head assembly for chip mounter having the same
US7967509B2 (en) 2007-06-15 2011-06-28 S.C. Johnson & Son, Inc. Pouch with a valve
US20220234174A1 (en) * 2021-01-22 2022-07-28 Delta Electronics, Inc. Vacuum clamping nozzle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62200480U (enrdf_load_stackoverflow) * 1986-06-10 1987-12-21

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511020A (en) * 1968-02-05 1970-05-12 Hydrahone Equipment Division Vacuum bag lifter
US3780489A (en) * 1972-06-01 1973-12-25 Grace W R & Co Vacuum packaging apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511020A (en) * 1968-02-05 1970-05-12 Hydrahone Equipment Division Vacuum bag lifter
US3780489A (en) * 1972-06-01 1973-12-25 Grace W R & Co Vacuum packaging apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137954A (en) * 1976-09-04 1979-02-06 Enzinger-Union-Werke Ag Liquids containers
US4745730A (en) * 1986-10-22 1988-05-24 Bartle Sr David C Method and apparatus for evacuating air from food containers
US5829223A (en) * 1996-07-10 1998-11-03 Rwc, Incorporated Apparatus for charging canisters with a high pressure gas
US6212854B1 (en) 1996-07-10 2001-04-10 Rwc, Inc. Apparatus for charging canisters with a high pressure gas
US7967509B2 (en) 2007-06-15 2011-06-28 S.C. Johnson & Son, Inc. Pouch with a valve
US20100263157A1 (en) * 2009-04-15 2010-10-21 Samsung Techwin Co., Ltd. Vacuum nozzle control apparatus and head assembly for chip mounter having the same
US8667671B2 (en) * 2009-04-15 2014-03-11 Samsung Techwin Co., Ltd. Vacuum nozzle control apparatus
US20220234174A1 (en) * 2021-01-22 2022-07-28 Delta Electronics, Inc. Vacuum clamping nozzle
US11745315B2 (en) * 2021-01-22 2023-09-05 Delta Electronics, Inc. Vacuum clamping nozzle

Also Published As

Publication number Publication date
CA1009625A (en) 1977-05-03
JPS5050188A (enrdf_load_stackoverflow) 1975-05-06
AU7297974A (en) 1976-03-11
ZA745440B (en) 1975-08-27
JPS5717772B2 (enrdf_load_stackoverflow) 1982-04-13

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Date Code Title Description
AS Assignment

Owner name: W.R. GRACE & CO.-CONN, A CORP. OF CT

Free format text: MERGER;ASSIGNORS:W.R. GRACE & CO.;GRACE MERGER CORPORATION;REEL/FRAME:005169/0141

Effective date: 19880525